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【单选题】
安全阀必须垂直安装，安全阀的阀座内径于( )mm；几个安全阀共同装设在一根与汽包相连的短管上时，短管通路截面积有几个安全阀门面积总和的( )倍。A.
25，1.25
B.
25，25
C.
1.25，25
D.
1.25，1.25
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举一反三
【单选题】Directions： There are 10 blanks in the following passage. For each blank there are four choices marked A), B), C) and D). You should choose the ONE that best fits into the passage.Remember back to whe...
A.
reward
B.
recall
C.
reflect
D.
remind
【简答题】Getting rid of dirt, in the opinion of most people, is a good thing. However, the attitudes to dirt are always changing. In the early 16th century, people thought that dirt on the skin was a means to ...
【单选题】Dirt should not be allowed to contaminate a grease lubricant because the _____.
A.
dirt will cause corrosion of bearing
B.
bearings will leak oil excessively
C.
dirt is very abrasive when mixed with grease
D.
grease will become inflammable
【单选题】If a place is dirt poor, it is ______.
A.
not poor at all
B.
extremely poor
C.
poor like dirt
D.
not so poor
【单选题】Directions：There are 10 blanks in the following passage. For each blank there are four choices marked A), B), C) and D). You should choose the ONE that best fits into the passage.Remember back to when...
A.
volume
B.
bulk
C.
proportion
D.
amount
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