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單項(xiàng)選擇題

The （） engine is used for alternators and some times for main propulsion with a gearbox to provide a propeller of between 90 to 120 rpm.

A.four-stroke
B.two-stroke
C.slow speed
D.reversible

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單項(xiàng)選擇題

The （） of the main shaft should be measured with a （）.

A.clearance；calipers
B.sinking；bridge gauge
C.diameter；bridge gauge
D.clearance；lead wire

單項(xiàng)選擇題

Such an engine frame helps （） the engine and so protect the bearings from the deformation forces transmitted via the ships double bottom.

A.to stiffen
B.to soften
C.to loosen
D.to wear

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