單項選擇題

The tube in a boiler should be blinded if found （）.

A.scaled
B.informed
C.leaky
D.deformed

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單項選擇題

The internal part of boiler should be welded by yard if found （）.

A.sealed
B.cracked
C.shape changed
D.deformed

單項選擇題

The internal part of the boiler, if found （）, has to be chemically washed by yard.

A.deformed
B.rusted
C.cracked
D.scaled