單項(xiàng)選擇題

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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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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