單項(xiàng)選擇題The four-stroke cycle begins with the piston （）.
A.coming up from the BDC
B.coming up from the TDC
C.coming down from the BDC
D.coming down from the TDC
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1.單項(xiàng)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
2.單項(xiàng)選擇題James Watt （）the steam engine in 1796.
A.discovered
B.had discovered
C.invented
D.had invented
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