问题 问答题 简答题

轴流风机的启动步骤有哪些?

答案

参考答案:

1.启动轴承润滑油泵,带有轴承冷却风机的则应启动轴承冷却风机。

2.动叶调节的轴流风机应将动叶角度关至0位,根据特性关闭相应进口或出口挡板,使风机空载启动。

3.启动风机主电动机,待电流正常后,开启相应进出口挡板。

4.风机启动后对风机运行情况进行一次全面检查。

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 following statements are right EXCEPT that______.

A. some modern drivers are not good at driving
B. road politeness is good sense as well as good manners
C. it is also right to have a tiger in the driver’s seat
D. a friendly driver should nod or wave thanks in answer to an act of politeness

单项选择题