單項選擇題()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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1.單項選擇題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

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

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

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

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