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單項(xiàng)選擇題

The four-stroke engine is used for （） and sometimes for main propulsion with a gearbox to provide a propeller speed of between 90 to 120 rev/min.

A.alternator
B.turbo-charger
C.remote controller
D.windlass

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單項(xiàng)選擇題

The four strokes are called suction, compression, expansion and exhaust, but only （） stroke provides the power to drive the ship.

A.suction
B.compression
C.expansion
D.exhaust

單項(xiàng)選擇題

The fine filters will be arranged （） one can be cleaned while the other is operating.

A.in order to
B.because of
C.so that
D.so as to

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