A(n) （） is a mechanical attack on the metal surface which may be due to a disturbance in the flow of the water over the blade of the propeller.

A (n) （） is a chemical or electro-chemical attack on th...

单项选择题A (n) （） is a chemical or electro-chemical attack on the metal surface which may be further increased if the sea-water is polluted.

A propeller of 5~65m in diameter, having a mean pitch o...

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.

In moving forward, a ship imparts forward motion to the...

单项选择题In moving forward, a ship imparts forward motion to the water at the stems, this is known as （）.