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单选题
Where a propeller shaft passes through the hull，water is prevented from entering by means of a（）.
A
stuffing box
B
propeller boss
C
seacock
D
stop-water
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单选题Where a propeller shaft passes through the hull，water is prevented from entering by means of a（）.A
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propeller bossC
seacockD
stop-water
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考题
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closed, and only slight leakage permitted across the shaft packingC
open, and no leakage permitted across the shaft packingD
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单选题With（） the engine need not to be aligned with reduction gears or propeller shaft.A
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