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[单选题]
27.下列关于白盒测试的叙述中,正确的是
A
适用于大型的复杂模块
B
根据程序的功能来设计测试用例
C
白金测试又称为结构测试
D
无需了解程序的内部结构和逻辑
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试题答案:
C
答案解释:
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某企业采用备抵法核算坏账,坏账准备按应收账款余额的5%计提。2000年初,“坏账准备”账户期初余额为2万元,当年末应收账款余额为100万元;2001年发生坏账3万元,收回以前年度已注销的坏账1万元。若2001年末应收账款余额为80万元,则当年应计提的坏账准备为()
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在政治文化结构中,渐次由低向高排列的是( )
3.
ge Three The large part which war played in English affairs in the Middle-Ages, the fact that the control of the army and navy was in the hands of those that spoke French, and the circumstances that much of English fighting was done in France all resulted in the introduction into English of a number of French military terms. The art of war has undergone such changes since the battles of Hastings, Lewes, and Agincourt that many words once common are now only in historical use. Their places have been taken by later borrowings, often like wise from French, many of them being words acquired by the French in the course of their wars in Italy during the sixteenth century. Yet we still use French words of the Middle Ages when we speak of the army and the navy, of peace, enemy, battle, soldier, guard and spy, and we have kept the names of officers such as captain and sergeant. Some of the French terms were introduced into English because they were needed to express a new object or a new idea. In other cases a French and a native English word for the same thing existed side by side. Sometimes one or the other has since been lost from the language; but sometimes both the borrowed and the native word have been still in common use.
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3.Friction is a force which opposes motion. Much of the energy supplied to a complicated machine with many moving parts is wasted in overcoming this opposition. The energy is converted into useless heat. The amount thus lost can be considerably reduced and the life of the machine prolonged by careful lubrication. This reduction improves the efficiency of the machine. Another way in which friction is reduced is to substitute roller or ball bearings for the earlier type of bearing, in which the surfaces in contact move by sliding. Bearings of these later types are used very extensively in many kinds of modern machinery.It must not be assumed, however, that friction is always a disadvantage. In many instances it is highly important. Belts are often used in conveying power from one machine to another. In the absence of friction, this could not be done. The driving wheel would not run the belt, neither would the belt run the wheel to driver. Without friction, then, belted machinery could not be used. Again in the case of all motor vehicles, friction is essential in the operation of the brake. Were there no friction, there could be no brake. But even this illustration does not give an adequate picture of the importance of friction. The vehicle could not even be started if it were not for the friction exerted between the tires and the road. Nails hold in wood, and screws hold in either wood or metal by reason of friction, without which they would be useless. Walking is difficult enough on an icy pavement, but it would be wholly impossible if there were no friction at all between the shoe and the pavement.(5分)3.1Friction arises when____.(1分)A. an opposing force of motion existsB. the energy is wastedC. everything is motionlessD. a complicated machine is supplied with energy
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