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物业服务企业招聘物业服务技术人员后，都会进行相应的岗前培训。某物业服务企业的岗前培训的主要内容包括建筑识图、建筑构造和建筑材料方面的基础知识以及建筑设备基础知识等。问题：

建筑材料中，与水有关的性质有哪些？

答案

参考答案：

建筑材料与水有关的性质。亲水性与憎水性、含水率、吸水性、吸湿性、耐水性、抗渗性、抗冻性。

判断题

干管布置常采用沿建筑物天花板水平布置方式。( )
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单项选择题

It is quite reasonable to blame traffic jams, the cost of" gas and the great speed of modern life, but manners on the toad are becoming horrible. Eye,body knows that the nicest men would become fierce tigers behind the wheel. It is all right to have a tiger in a cage, but to have one in the driver’s seat is another matter.
Road politeness is not only good manners, but good sense too. It takes the most cool-headed drivers great patience to give up the desire to beat back when forced to face rude driving. On the other hand, a little politeness goes a long way towards reducing the possibility of quarrelling and fighting. A friendly nod or a wave of thanks in answer to an act of politeness helps to create an atmosphere of good will and calmness so necessary in modern traffic conditions. But such behaviors of politeness are by no means enough. Many drivers nowadays don’t even seem able to recognize politeness when they see it.
However, misplaced politeness can also be dangerous. Typical examples are the driver who waves a child crossing the street at a wrong place into the path of oncoming cars that may be not able to stop in time. The same goes for encouraging old ladies to cross the road wherever and whenever they want to.
An experienced driver, whose manners are faultless, told me it would help if drivers learnt to correctly join in traffic stream without causing total blockages that give rise to unpleasant feelings. Unfortunately, modern drivers can’t even learn to drive,let alone master the roadmanship. Years ago, experts warned us that the fast increase of the car ownership would demand more give-and-take from all road users. It is high time for all of us to take this message to heart.

The passage mainly talks about______.

A. road politeness


B. traffic jams
C. good manners


D. modern drivers
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