單項選擇題The two-stroke cycle begins with the piston coming up from the BDC, with the scavenging ports in the sides of the cylinders being ().

A.open
B.uncover
C.covered
D.closed


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1.單項選擇題Hearing a strong noise, () at once.

A.the engine stopped
B.the engine was stopped
C.he stopped the engine
D.he had stopped the engine

2.單項選擇題() that everything in the engine crankcase is correct, start up the crankcase lubricating oil pump.

A.To satisfy
B.To be satisfied
C.After satisfying
D.After being satisfied

3.單項選擇題Cooling () the engine metals retain their mechanical properties.

A.forces
B.enables
C.makes
D.is able to

4.單項選擇題The data to be recorded on this sheet () the performance of the engine.

A.makes the experts to judge
B.enables the experts to judge
C.make the experts judging
D.enable the experts to judge