单项选择题
A propeller of 5~65m in diameter, having a mean pitch of 4~88m, turning at 72 rpm, at a speed of 11 knots (339~79m/min), will give （） of apparent slip.
A.0~967
B.0~033
C.0~031
D.0~969
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相关考题
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单项选择题
In moving forward, a ship imparts forward motion to the water at the stems, this is known as （）.
A.the speed of the vessel
B.the speed of the propeller
C.the wake
D.the wake fraction -
单项选择题
Wake varies considerably with the form of the vessel, but, generally speaking, the bluffer the ship （） the wake value.
A.the higher
B.the lower
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单项选择题
When viewed from astern, if the propeller revolves in a clockwise direction when going ahead, it is known as （）.
A.ahead direction
B.astern direction
C.right-handed
D.left-handed
