在管线打开前，应确认工作现场周围的安全冲淋装置是否可用。应根

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问题单项选择题

在管线打开前，应确认工作现场周围的安全冲淋装置是否可用。应根据危险物质特性在必要时安装临时冲淋装置，且临时冲淋装置距作业点不超过（），水量应能连续冲淋15分钟。

A、10米

B、20米

C、30米

D、40米

答案

参考答案：B

改错题

短文改错

It is five years now since I graduate from No.3 High

School．Last Saturday，the class that I was on held a

get-together，which took us a long time prepare．It

was indeed not easy to get in the touch with everybody

and set a well time for all of us．We all enjoyed

this precious day greatly，remember the time we spent

together and the people they were familiar with．It was

a pity which some of us were not present as they had

gone abroad for further studies，but they called back

or sent greeting card from different places．

单项选择题

一般情况下，协调合理的价格体系主要通过( )的作用，使价格在正常市场环境中形成合理的比价和差价关系。

A．价格政策

B．政府有效干预

C．价格指导

D．市场机制