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
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 （）.
单项选择题 Hearing a strong noise, （） at once.
单项选择题 （） that everything in the engine crankcase is correct, start up the crankcase lubricating oil pump.
