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Some vessels are equipped with a water lubricated stern robeWhen at sea, operating under normal conditions, the water service valve from the ships saltwater system to the bearing should be （）.
A:closed, and no leakage permitted across the shaft packing
B:closed, and only slight leakage permitted across the shaft packing
C:open, and no leakage permitted across the shaft packing
D:open, and only slight leakage permitted across the shaft packing

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出自：海船船员证

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