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【单选题】
对于经济增长的源泉,下列哪个说法是错误的A.
技术进步
B.
人力资本
C.
制度创新
D.
人口增长率要大于生产量的增长率
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举一反三
【单选题】Huawei Mate 10 pro, a popular smart phone, when it was first introduced in the market 3 years ago, its initial price was 4899 RMB, few people could actually afford it, the phones were purchased only b...
A.
Skimming
B.
Penetration
C.
Cost
D.
Mantissa
【简答题】一对直齿圆锥齿轮传动,主动轮 z 1 =17 ,转速 n 1 =800r / min ,从动轮 z 2 =38 。求其传动比 i 12 = ,从动轮转速 n 2 = r/min(保留小数点后一位) 。
【简答题】Many buildings ______ by the earthquake. (destroy)
【单选题】听力原文： The world's first completely automatic railway has been built under the busy streets of London. The railway is called the Victoria Line, and it is part of the complete London underground railway...
A.
The workers on the underground platforms were replaced by machines.
B.
It became the first completely automatic railway in the world.
C.
A completely automatic line was added to its network.
D.
Its trains became computer-controlled.
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