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單項(xiàng)選擇題

（）the moveable plate and floating ring inside the pump is very difficult.

A.Having adjusted
B.Being adjusted
C.To adjust
D.Adjusted

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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

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