单项选择题
A.then B.than C.when D.after
The term “moderate speed” was previously interpreted as...
单项选择题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
The two-stroke cycle begins with the piston coming up f...
单项选择题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
Hearing a strong noise, （） at once.A.the engine stopped...
单项选择题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
