Which of the following items don’t belong to dock repair works?A.the S.W outboard valvesB.

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Which of the following items don’t belong to dock repair works?

A.the S.W outboard valves

B.the tailshaft L.O stop valve

C.the drain valve of the boiler

D.propeller shaft sealing device

请帮忙给出正确答案和分析,谢谢!

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