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问题 单项选择题

法兰式连接的制动管新制时，组焊后须采用经滤水、滤尘的压缩空气吹净并进行（）气密性试验。

A.400kPa

B.500kPa

C.600kPa

D.700kPa

答案

参考答案：C

完形填空

阅读下面材料，在空白处填入适当的内容或括号内单词的正确形式。

It seems recently that more and more of my friends are facing some seemingly unbeatable challenges in their lives. Some have lost their jobs and some have __ 小题1:___ (fail) marriages. All too many have health problems.

I don’t know if it is desperation __小题2:___ causes them to turn to me for advice or whether they have come to value our friendship. But __小题3:___ is difficult to offer words of hope when all they feel is hopeless. They expect answers to get them back __小题4:___ their feet again.

I have often struggled with what to say,  ___小题5:___ (most) because I have faced many of the same challenges in my own life. I remember how empty I felt after someone cheerfully offered words like “Things will get better!”

Now , being thought of __小题6:___ a source of hope or a good example of what to do through printed words, I have even __小题7:___ (many) people contacting me.

So what do I say? “Begin again.”

It sounds too simple, __小题8:___ it is indeed the answer. All life __小题9:___(challenge) bring about an ending and the chance for __小题10:___(begin).
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多项选择题

自中药中提取苷类成分，常选用的溶剂是

A.水

B.乙醇

C.醋酸乙酯

D.乙醚

E.石油醚
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