题目内容
（请给出正确答案）
If no signal is sent from the command spot, what will happen to the train？
A．It will stop automatically.
B．It will move on at the same speed.
C．It will gradually slow down.
D．It will keep a safe distance from the other trains.
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更多“If no signal is sent from the …”相关的问题
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A、Sensor produces a signal relating to the quantity being measured
B、Sensor can generate a change based on the physical change
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听力原文： In recent years many countries of the world have been faced with the problem of how to make their workers more (21) productive. Some experts (22) claim the answer is to make jobs more varied. But do more varied jobs lead to greater productivity？ There is (23) evidence to suggest that while variety certainly makes the worker's life more enjoyable, it does not (24) actually make it harder. As far as increasing productivity is (25) concerned, variety is not an important factor.
Other experts feel that giving the worker freedom to do his job in his own way is important and there is no (26) doubt that this is true. The problem is that this kind of freedom cannot easily be given in the modem factory with its complicated (27) machinery which must be used in a fixed way.
To what extent does more money lead to greater productivity？ The workers themselves certainly think this is important. But (28) perhaps they want more money only because the work they do is so boring. Money just lets them enjoy their spare time more. A similar (29) argument may explain demands for shorter hours. Perhaps if we (30) succeed in making their jobs more interesting, neither more money, nor shorter working hours will be so important to them.
In recent years many countries of the world have been faced with the problem of how to make their workers more【21】. Some experts【22】the answer is to make jobs more varied. But do more varied jobs lead to greater productivity？ There is【23】to suggest that while variety certainly makes the worker's life more enjoyable, it does not【24】make it harder. As far as increasing productivity is【25】, variety is not an important factor.
Other experts feel that giving the worker freedom to do his job in his own way is important and there is no【26】that this is true. The problem is that this kind of freedom cannot easily be given in the modem factory with its complicated【27】which must be used in a fixed way.
To what extent does more money lead to greater productivity？ The workers themselves certainly think this is important. But【28】they want more money only because the work they do is so boring. Money just lets them enjoy their spare time more. A similar【29】may explain demands for shorter hours. Perhaps if we【30】in making their jobs more interesting, neither more money, nor shorter working hours will be so important to them.
(21)
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