国产免费无码视频,欧美性猛交99久久久久99

單項選擇題Mooring winches are often combined with （） units so that one prime mover drives both.

A.crane
B.hatch cover
C.windlass
D.steering gear

您可能感興趣的試卷

你可能感興趣的試題

1.單項選擇題Due to the large amount of heat picked up by the air in boiler and engine rooms, it would be （） to maintain ambient conditions within the comfort zone by air conditioning.

A.possible
B.necessary
C.practicable
D.impracticable

點擊查看答案

2.單項選擇題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.erosion
B.corrosion
C.pitting
D.dezincification

點擊查看答案

3.單項選擇題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.erosion
B.corrosion
C.cavity
D.scouring

點擊查看答案

4.單項選擇題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

點擊查看答案

5.單項選擇題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

點擊查看答案