單項選擇題Pump up the starting air reservoirs to their maximum pressure and ()the air reservoirs and air system.

A.open
B.close
C.drain
D.vent


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1.單項選擇題James Watt ()the steam engine in 1796.

A.discovered
B.had discovered
C.invented
D.had invented

2.單項選擇題Energy loses ()friction occurs in every engine.

A.because
B.thanks to
C.dues to
D.owing to

5.單項選擇題A diesel engine which is rated for normal operation at a crankshaft speed of 800 RPM, is commonly classed as a ().

A.slow-speed diesel
B.medium-speed diesel
C.high-speed diesel
D.constant-speed diesel