问题
判断题
60kg/m钢轨12号提速无缝道岔，允许尖轨与基本轨有一定的相对位移，以部分地释放钢轨温度力。当位移至极限位置时，限位器将部分温度力向基本轨传递，并限制尖轨与基本轨进一步相对位移。
答案
参考答案：对
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60kg/m钢轨12号提速无缝道岔，允许尖轨与基本轨有一定的相对位移，以部分地释放钢轨温度力。当位移至极限位置时，限位器将部分温度力向基本轨传递，并限制尖轨与基本轨进一步相对位移。
参考答案：对
Fear and its companion pain are two of the most useful things that men and animals possess, if they are properly used. If fire did not hurt when it burnt, children would play with it until their hands were burnt away. Similarly, if pain existed but fear didn’t, a child would burn himself or herself again and again, because fear would not warn himself or herself to keep away from the fire that had burnt himself or herself before. A really fearless soldier—and some do exist is not a good soldier because he is soon killed; and a dead soldier is of no use to his army. Fear and pain are therefore two guards without which men and animals might soon die out. In our first sentence we suggested that fear should be properly used. If, for example, you never go out of your house because of the danger of being knocked down and killed in the street by a car, you are letting fear rule you too much. Even in your house you are not absolutely safe: an aeroplane may crash on your house, or ants may eat away some of the beams in your roof so that the latter falls on you, or you may get cancer! The important thing is not to let fear rule you, but instead to use fear as your servant and guide. Fear will warn you of dangers; then you have to decide what action to  take. In many cases, you can take quick and successful action to avoid the danger. For example, you see a car coming straight towards you. Fear warns you, you j  ump out of the way, and all is well.In some cases, however, you decide that there is nothing that you can do to avoid the danger. For example, you can’t prevent an aeroplane crashing onto your house. In this case, fear has given you its warning; you have examined it and decided on your course of action, so fear of this particular danger is no longer of any use to you, and you have to try to overcome it. 小题1:Children would play with fire until their hands were burnt away if _________.
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