单项选择题
The tube in a boiler should be blinded if found ().
A.scaled
B.informed
C.leaky
D.deformed
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相关考题
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单项选择题
The internal part of boiler should be welded by yard if found ().
A.sealed
B.cracked
C.shape changed
D.deformed -
单项选择题
The internal part of the boiler, if found (), has to be chemically washed by yard.
A.deformed
B.rusted
C.cracked
D.scaled -
单项选择题
Centrifugal pumps can be designed with a number of impellers () to attain a high final delivery pressure.
A.in series
B.in parallel
C.either A or B
D.None of the above is tree
