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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2.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

3.單項(xiàng)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

4.單項(xiàng)選擇題Cooling () the engine metals retain their mechanical properties.

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

5.單項(xiàng)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