面对信息化时代，稍不注意就会脱轨，所以及时的补充知识才能让我们与时俱进，今天给大家带来的是关于solidityrequire和的一篇文章，相信会给你带来较大的帮助！
比特派钱包里有以太坊ETH的批量转账工具，复制多个地址，然后打开钱包即可，非常简单。
在Solidity中，一个合约由一组代码（合约的函数）和数据（合约的状态）组成。合约位于以太坊区块链上的一个特殊地址。uint storedData; 这行代码声明了一个状态变量，变量名为storedData，类型为 uint （256bits无符号整数）。你可以认为它就像数据库里面的一个存储单元，跟管理数据库一样，可以通过调用函数查询和修改它。在以太坊中，通常只有合约 的拥有者才能这样做。在这个例子中，函数 set 和 get 分别用于修改和查询变量的值。
跟很多其他语言一样，访问状态变量时，不需要在前面增加 this. 这样的前缀。
这个合约还无法做很多事情（受限于以太坊的基础设施），仅仅是允许任何人储存一个数字。而且世界上任何一个人都可以来存取这个数字，缺少一个（可靠 的）方式来保护你发布的数字。任何人都可以调用set方法设置一个不同的数字覆盖你发布的数字。但是你的数字将会留存在区块链的历史上。稍后我们会学习如 何增加一个存取限制，使得只有你才能修改这个数字。
代币的例子
下面的合约将实现一个形式最简单的加密货币。空中取币不再是一个魔术，当然只有创建合约的人才能做这件事情（想用其他货币发行模式也很简单，只是实现细节上的差异）。而且任何人都可以发送货币给其他人，不需要注册用户名和密码，只要有一对以太坊的公私钥即可。
注意
对于在线solidity环境来说，这不是一个好的例子。如果你使用在线solidity环境 来尝试这个例子。调用函数时，将无法改变from的地址。所以你只能扮演铸币者的角色，可以铸造货币并发送给其他人，而无法扮演其他人的角色。这点在线 solidity环境将来会做改进。
1
In all preparations for installation after the end of the work, in order to open the packaging cleaning bearings bearings. For the use of antirust oil seal bearing, prior to use kerosene or gasoline ( pay attention to the fire ) for cleaning. On the viscosity of antirust grease ( now rarely used) sealed bearings, can use the oil temperature is not more than 100℃light mineral oil such as 10 mechanical oil and transformer oil dissolved, then using kerosene and gasoline cleaning. On the use of lubricating oil seal for bearings and sealed bearings can be directly installed and used without cleaning. After cleaning the bearing should be installed, to avoid contamination. Can not be installed, should be placed in a clean place and pay attention to rust. Need of manual cleaning of bearings, can be in the hands of apply anti-rust agent and isolation.
13.1.2 installation method
Bearing installation method of the main pressure method, temperature method and hydraulic method in three ways.
·pressure method
Under the condition of normal temperature does not change with the size of parts, directly using the pressure of installation ( or remove ) method called pressure method, see figure 13.2. This method is generally used for the amount of surplus small medium and small type bearing mounting and dismounting. For the larger magnitude of interference or large bearings, as well as the stiffness of the weaker parts should avoid taking this method, to avoid the associated part deformation.
With pressure mounting bearing, bearing should be in uniform pressure on the end face, and always maintain the bearing and axle neck and bearing seat hole concentric, prevent deflection. All through the rolling body and a holding frame transmission pressure, it will damage the bearing parts bearing working surface, the normal play performance. Should stop with a hammer percussion tools such as direct bearing phenomenon.
Pressure method can be used to press, a lock nut or a soft metal hammer in bearing end circumference of percussion to achieve. The method of pressure can be with the surface smearing lubricant with moderate to protect surface, but attention to excessive use of lubricant will affect the fit quality, causing the bearing running skid phenomenon, especially on the amount of surplus small complexes should be used cautiously lubricant.
Temperature difference method
When the larger magnitude of interference or in use need frequent dismounting bearing pressure method, assembly and disassembly is easy to damage the mating surface of bearing. This can be considered the temperature difference method installation. Temperature difference method is utilized to heat ( expansion ) or frozen ( shrinkage ) method of making bearing interference temporarily disappear, to be normal after recovery to achieve the purpose of convenient mounting and dismounting bearing.
The use of assembly and disassembly of bearing temperature method, regardless of the selection of the heating or cooling mode, the main is to control the temperature of the bearing. The heating temperature is too high, can make bearing materials, hardness or the dimension precision of change, the temperature is too low ( freezing temperature ) can make bearing brittle failure. In general, the bearing temperature should be lower than the material of tempering temperature 60～ 70 ℃, for plain bearing steel, the highest heating temperature should be controlled at 100℃. Freezing temperature control in 50℃.
Temperature difference method commonly used methods of oil heating, air heating, flame heating method and electric induction heating method. The air heating temperature heating box, electric induction heating process it is necessary to design a special electromagnetic induction device. The advantages of the two methods is easy to control the heating temperature, electromagnetic induction heating is particularly applicable to the same specifications bearing installation mass. Flame heating method in use should pay attention to the flame can’t distance parts surface too close to avoid damage parts of the surface, the operation should be along the circumference uniformly heating. In real work, the most commonly used is the oil heating method, this method is simple, does not require special tools, heating oil by non corrosive mineral oil, such as transformer oil, in the flash point of 250 ℃, installation uses the oil bath heating, see figure 13.3. Oil bath heating, the transformer oil in oil tank, the oil tank bottom is provided with a distance of 60 mm tank bottom bracket, bearing on the holder, is designed for uniform heating and prevent the heating process in the groove axial bearing pollution, put a thermometer for temperature control. Oil heating method suitable for small bearing mounting, but also to the separable or nonseparable bearings are suitable for.
(Cryptic Coloring)
Cryptic coloring is by far the commonest use of color in the struggle for existence. It is employed for the purpose of attack (aggressive resemblance or anticryptic coloring ) as well as of defense (protective resemblance or procryptic coloring ). The fact that the same method concealment, may be used both for attack and defense has been well explained by T.Belt who suggests as an illustration the rapidity of movement which is also made use of by both pursuer and pursued, which is similarly raised to a maximum in both by the gradual dying out of the slowest through a series of generations. Cryptic coloring is commonly associated with other aids in the struggle for life. Thus well-concealed mammals and birds, when discovered, will generally endeavor to escape by speed and will often attempt to defend themselves actively. On the other hand, small animals which have no means of active defense, such as large, numbers of insects, frequently depend upon concealment alone. Protective resemblance is far commoner among animals than aggressive resemblance, in correspondence with the fact that predaceous forms are as a rule much larger and much less numerous than their prey. In the case of insectivorous Vertebrata and their prey such differences exist in an exaggerated form. Cryptic coloring, whether used for defense of attack, may be either general or special. In general resemblance the animal, in consequence of its coloring, produces the same effect as its environment, but the conditions do not require any special adaptation of shape and outline. General resemblance is especially common among the animal inhabiting some uniformly colored expanse of the earth’s surface, such as an ocean or a desert. In the former, animals of all shapes are frequently protected by their transparent blue color, on the latter, equally diverse forms are defended by their sandy appearance. The effect of a uniform appearance may be produced by a combination of tints in startling contrast. Thus the black and white stripes of the zebra blend together at a little distance, and “their proportion is such as exactly to match the pale tint which arid ground possesses when seen by moonlight.” Special resemblance is far commoner than general and is the form which is usually met with on the diversified surface of the earth, on the shores, and in shallow water, as well as on the floating masses of algae on the surface of the ocean, such as the Sargasso Sea. In these environments the cryptic coloring of animals is usually aided by special modifications of shape, and by the instinct which leads them to assume particular attitudes. Complete stillness and the assumption of a certain attitude play an essential part in general resemblance on land; but in special resemblance the attitude is often highly specialized, and perhaps more important than any other element in the complex method by which concealment is effected. In special resemblance the combination of coloring, shape, and attitude is such as to produce a more or less exact resemblance to some one of the objects in the environment, such as a leaf of twig, a patch of lichen, a flake of bark. In all cases the resemblance is to some object which is of no interest to the enemy or prey respectively. The animal is not hidden from view by becoming indistinguishable from its background as in the case of general resemblance, but it is mistaken for some well-know object.
In seeking the interpretation of these most interesting and elaborate adaptations, attempts have been made along two lines. The first seeks to explain the effect as a result of the direct influence of the environment upon the individual (G.L.L.Buffon), or by the inherited effects of efforts and the use and disuse of parts (J.B.P.Lamarck). The second believes that natural selection produced the result and afterwards maintained it by the survival of the best concealed in each generation. The former suggestion breaks down when the complex nature of numerous special resemblances is appreciated. Thus the arrangement of colors of many kinds into an appropriate pattern requires the cooperation of a suitable shape and the rigidly exact adoption of a certain elaborate attitude. The latter is instinctive and thus depends on the central nervous system. The cryptic effect is due to the exact cooperation of all these factors; and in the present state of science, the only possible hole of an interpretation lies in the theory of natural selection, which can accumulate any and every variation which tends toward survival. A few of the chief types of methods by which concealment is effected may be briefly described. The colors of large numbers of vertebrate animals are darkest on the back and become gradually lighter on the sides, passing into white on the belly. Abbot H. Thayer has suggested that this gradation obliterates the appearance of solidity, which is due to shadow. The color harmony, which is also essential to concealment, is produced because the back is of the same tint as the environment (e. g. earth), bathed in the cold blue-white of the sky, while the belly, being cold blue-white and bathed in shadow and yellow earth reflections produces the same effects. This method of neutralizing shadow for the purpose of concealment by increased lightness of tint was first suggested by E.B.Poulton in the case of a larva and a pupa, but he did not appreciate the great importance of the principle. In an analogous method an animal in front of a background of dark shadow may have part of its body obliterated by the existence of a dark tint, the remainder resembling, e.g., a part of a leaf. This method of rendering invisible any part which would interfere with the resemblance is well know in mimicry.
这篇文章以一般到具体的协作和分类方式写作，第一段点出生物界生存竞争中最常用的一种颜色是保护色，保护色可分为两类：进犯（进攻）型和防卫型。一般是防御性保护色多于进攻型。而两种类型都可归纳为一般性模仿和专门（特定）模仿。居住（栖息）在单一色泽的地方的动物，如海洋或沙漠，常采用模仿性保护色——如透明的绿色，土色等，而特定摸刚的动物则栖息在多样性的地方，如海岸，浅水，海洋表面等。特定模仿还需要有改变形状姿势之协作，使其看起来像客观环境中的某物，某种身份mistaken identify.
第二段涉及上述文章内容就是模仿性的解释的探索，结果为二。一种观点是环境直接影响的结果。第二种是自然选择的结果。当人们理解了许多特定模仿的复杂特性时，第一种解释就不能成立了。这说明保护效果是一切因素——合适的外形和某种精心设计的姿势等——合作而成。按现在科学水平来解释，只能归之“自然选择”理论，然后是用具体例子来证实。
希望对你有用。
你好，很高兴为你解答:
Garbage is a solid or fluid substance that is not needed or useless.
词汇释义
垃圾rubbish; garbage; refuse; breeze
需要need; want; require; demand
无用useless; of no use
固体solid body; solid; solidity
流体fluid; fluor
物质matter; substance; material
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