单选题During the dock repair, each sea valve must be disassembled, cleaned and ground well.Before it reassemble the sealing surface between the valve and the valve seat should be checked by （）Achief engineerBsurveyorCthe engineerDthe technique personnel of the shipyard
单选题
During the dock repair, each sea valve must be disassembled, cleaned and ground well.Before it reassemble the sealing surface between the valve and the valve seat should be checked by （）
A
chief engineer
B
surveyor
C
the engineer
D
the technique personnel of the shipyard
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