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【单选题】
下面关于燃气管道试验表述错误的是（ ）。A.
强度试验时，当管道设计压力≤0．8MPa时，试验介质为空气
B.
强度试验时，当管道设计压力＞0．8MPa时，试验介质为清洁水
C.
经分段试压合格的管段相互连接的焊缝，经射线照相检验合格后，可不再进行强度试验
D.
所有未参加严密性试验的设备、仪表、管件，复位后应采用肥皂水检查设备、仪表、管件及其与管道的连接处
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皮皮学刷刷变学霸
举一反三
【单选题】光栅传感器的工作原理, 是将被测物体的位移通过光栅转换成 的移动,再将条纹移动转换从电信号变化,从而检测直线位移或角位移。
A.
光线
B.
光栅尺
C.
莫尔条纹
D.
电信号
【单选题】光栅传感器的工作原理是将被测物体的位移通过光栅转换成()的移动,再将条纹移动转换从电信号变化,从而检测直线位移或角位移。
A.
光线
B.
莫尔条纹
C.
光栅尺
D.
电信号
【单选题】______ surprised us most was that with all his money, he _______ worry about a little thing like 5 cents.
A.
It; could
B.
What; could
C.
What; should
D.
It; should
【单选题】The first thing that ______ in his speech is that he didn’t put us in the picture at all about the war.
A.
stands by
B.
stands in
C.
stands out
D.
stands for
【简答题】什么是顾客的满意度和顾客的忠诚度
【简答题】阅读理解。 Jeff Green can not look after his things. Look, this is his room. He doesn't put his things away (收好) every day. Look at his desk. Many things are on it. They are notebooks, CDs, video tapes, pe...
【简答题】A student went to college after 21 all his school examinations. There he put his name down for world geography,22 after the first day, he did not go to 23 any more. The teacher noticed that this stude...
【简答题】Translation : 他献身于教育事业。
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