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

时间:2022-09-25 13:50:18 所属题库:船舶辅助机械题库

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