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單項(xiàng)選擇題

The term “moderate speed” was previously interpreted as meaning a speed which would enable a vessel （）within half the range of visibility.

A.stopping
B.being stopped
C.to stop
D.to be stopped

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單項(xiàng)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

單項(xiàng)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

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