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
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相关考题
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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
C.the faster
D.the slower -
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 -
单项选择题
The pitch ratio of a propeller is the mean pitch divided by （）.
A.the propeller diameter
B.the propeller radius
C.the pitch angle
D.the length of helix
