问题
单项选择题
水银气压表的温度差订正是由于水银与________的膨胀系数不同所致。
A．内管玻璃
B．铜尺
C．外套管
答案
参考答案：B
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水银气压表的温度差订正是由于水银与________的膨胀系数不同所致。
A．内管玻璃
B．铜尺
C．外套管
参考答案：B
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| When I come across a good article in reading newspapers, I often want to cut and keep it.But just as I am about to do so, I find the article on the __1__ side is as much interesting.It may be a discussion of the way to __2__ in good health, or __3__ about how to behave and conduct oneself in society.If I cut the front article, the opposite one is likely to __4__ damage, leaving out half of it or keeping the text __5__ the title.Therefore, the scissors would __6__ before they start, __7__ halfway done when I find out the __8__ result. Sometimes two things are to be done at the same time, both worth your __9__.You can only take up one of them, the other has to wait or be __10__ up. But you know the future is unpredictable-the changed situation may not allow you to do what is left __11__.Thus you are __12__ in a difficult position and feel sad.How __13__ that nice chances and brilliant ideas should gather around all at once?It may happen that your life __14__ greatly on your preference of one choice to the other. In fact that is what __15__ is like:we are often __16__ with the two opposite sides of a thing which are both desirable like a newspaper cutting.It often occurs that your attention is drawn to one thing only __17__ we get into another.The __18__ may be more important than the latter and give rise to divided mind.I __19__ remember a philosopher's remarks, "When one door shuts, another opens in life."So a casual __20__ may not be a bad one. | ||||
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