Which of the following items don’t belong to dock repair works?（）<br>A:the SW outboard valves<br>B:the tailshaft LO stop valve<br>C:the drain valve of the boiler<br>D:propeller shaft sealing device

Which of the following items don’t belong to dock repair works?（）
A:the SW outboard valves
B:the tailshaft LO stop valve
C:the drain valve of the boiler
D:propeller shaft sealing device

出自：海船船员证

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