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第7题 我国社会主义经济发展必须始终( )
A
以经济效益为中心
B
以发展速度为中心
C
以平衡比例为中心
D
以经济增长为中心
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参考答案
试题答案：
A
答案解释：
速度、效益、比例是国民经济发展中的1个重要因素。国民经济的发展。要求有较高的经济发展速度，而加快经济发展速度是以提高经济效益为前提的，平衡比例是为了收到更好的经济效益。这样看来只有“A”符合题意。
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四、IV. Reading Comprehension ( 60 points )
选出下列选项中划线部分读音不同的选项（ ）
What’s the reason for twins to be at a disadvantage in their intellectual development?
The four men did not feed the cows because __________.
第31题答案是（ ） 查看材料
Susan wants to know whether themeasures have been agreed
第25题答案是（ ）
第32题答案是（ ）
根据以下材料，回答40-43题
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22. What significanceDid Turing's theory have on theDevelopment ofAI?____
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29.企业中支持信息系统运行管理、承担信息化工具支持服务的职能机构是
3.
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)3.1 Friction arises when____.(1分)A. an opposing force of motion exists B. the energy is wastedC. everything is motionlessD. a complicated machine is supplied with energy
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在Word文本中,一次只能定义一个文本块。
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