问题
单项选择题
气密性试验达到设计压力后，稳压时间不少于（）min。
A.10
B.20
C.25
D.30
答案
参考答案：D
解析：气密性试验时，压力应缓慢上升，达到试验压力后，保压时间不少于30min，同时对焊缝和连接部位等用检漏液检查，无泄漏为合格。
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气密性试验达到设计压力后，稳压时间不少于（）min。
A.10
B.20
C.25
D.30
参考答案：D
解析：气密性试验时，压力应缓慢上升，达到试验压力后，保压时间不少于30min，同时对焊缝和连接部位等用检漏液检查，无泄漏为合格。
Charlie is twenty-three now. He1a university(大学) and found work in a factory last year. It’s2and there are no more than fifty workers in it. And only he3in a university. So he looks down upon his 4 . He always thinks he’s right and never agrees with5. He likes to say, “I’ve never made a mistake!” But once the young man couldn’t6 a foreign instructions （说明书）. An old worker studied it for two days and7Mr. White, the boss of the factory,8it meant. The boss asked Charlie why. He made a few excuses to say for9. And he didn’t agree with the old man. The boss became angry and asked, “ Is it10 that you’ve never made a mistake?” The young man wouldn’t make Mr. White11 and had to say, “No, it isn’t, sir.” Having12 this, the workers were happy. One of them asked, “ It means that you also make some mistakes!” Charlie13 his mind at once and said, “ I made only one mistake in my14 !” “When?” the boss asked in surprise. “ Just now, sir.” Answered the young man. “When Mr. White15 me acknowledge （承认）I was wrong!”
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