单项选择题
In a （） boiler the water flows through the inside of the tubes while the hot gases pass around the outside.
A.water-tube
B.fire-tube
C.exhaust gas
D.none of the above
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相关考题
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单项选择题
The tube in a boiler should be blinded if found （）.
A.scaled
B.informed
C.leaky
D.deformed -
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
