什么是绝缘距离?

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问题:

什么是绝缘距离?

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黑度大小与物体()无关。

A、种类

B、表面状况

C、表面温度

D、密度

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《公路工程国内招标文件范本》规定,对于合同规定的任何材料或设备的正规检查或检验的时间,监理工程师至少应提前( )小时通知承包人其到场时间。

A.12

B.24

C.36

D.48

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下列安全协议中,()能保证交易双方无法抵赖。

A.SET

B.SHTTP

C.PGP

D.MOSS

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It is all very well to blame traffic jams, the cost of petrol and the quick pace of modern life, but manners on the roads are becoming horrible. Everybody knows that the nicest men become monsters behind the wheel. It is all very well, again to have a tiger in the bank, but to have one in the driver’s seat is another matter altogether. You might tolerate the rude and inconsiderate driver, but nowadays the well-mannered motorist is the exception to the rule. Perhaps the situation calls for a "Be Kind to Other Drivers" campaign, otherwise it may get completely out of hand.

Road politeness is not only good manners, but good sense too. It takes the most cool-headed and good-tempered drivers to resist the temptation to revenge then subjected to uncivilized behavior. On the other hand, a little politeness goes a long way towards relieving the tensions of driving. A friendly nod or a wave of acknowledgement in response to an act of politeness helps to create an atmosphere of goodwill and tolerance so necessary in modern traffic conditions. But such acknowledgements of politeness are all too rare today. Many drivers nowadays don’t even seem able to recognize politeness when they see it.

However, improper politeness can also be dangerous. Typical examples are the driver who brakes violently to allow a car to emerge from a side street at some hazard to following traffic, when a few seconds later the road would be clear anyway; or the man who waves a child across a zebra crossing into the path of oncoming vehicles that may be unable to stop in time. The same goes for encouraging old ladies to cross the road wherever and whenever they want to.

A veteran driver, whose manners are faultless, told me it would help if motorists learnt to filter correctly into traffic streams one at a time without causing the total blockages (堵塞) that give rise to bad temper. Unfortunately, modern motorists can’t even learn to drive, let alone be well-mannered on the road. Years ago the experts warned us that the car-ownership explosion would demand a lot more give-and-take from all road users. It is high time for us to take this message to heart.

Experts have long pointed out that in the face of car-ownership explosion ().

A. road users should make more sacrifice

B. drivers should be ready to yield to each other

C. drivers should have more communication among themselves

D. drivers will suffer great loss if they pay no respect to others

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钻探施工地点要事先挖好排水沟和保证通风良好,检查()后,方可作业。

A、顶底板岩性

B、瓦斯浓度不超限

C、钻机完好性

D、水泵完好性

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