Propeller running at ____ are generally efficient.
A.high speeds
B.medium speed
C.low speeds
D.the same speed with the engine
第1题
A.two strokes of the piston
B.four strokes of the piston
C.one revolution of the crankshaft
D.four revolutions of the crankshaft
第2题
A.Advanced ignition
B.Clogged air intake
C.Leaky exhaust valve
D.High exhaust pressure
第3题
A.the outlet of oil
B.the outlet of water
C.the bowl periphery
D.the center of bowl
第4题
A.The bedplate
B.The column
C.The main bearing
D.The double bottom
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