单选题During the dock repair, when installing the tail shaft and propeller, who should be on the spot to supervise?（）Achief engineerBthe engineerCcaptainDany member of the engine department
单选题
During the dock repair, when installing the tail shaft and propeller, who should be on the spot to supervise?（）
A
chief engineer
B
the engineer
C
captain
D
any member of the engine department
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单选题Which of the following items don’t belong to dock repair works?（）Athe SW outboard valvesBthe tailshaft LO stop valveCthe drain valve of the boilerDpropeller shaft sealing device
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