单项选择题
A.strength B.dense C.percentage D.velocity
When the water produced from most evaporator is supplie...
单项选择题When the water produced from most evaporator is supplied for drinking purpose, it must be treated to ensure it is biologically pure and （）.
A.slightly acidic B.slightly alkaline C.no salty D.slightly bitter
When the starting air valve closes on one cylinder, ano...
单项选择题When the starting air valve closes on one cylinder, another starting air valve has （） opened on another cylinder whose piston has just commenced its downward stroke.
A.just B.nearly C.merely D.already
When the order （） is received from the bridge, the main...
单项选择题When the order （） is received from the bridge, the main air stop valve in the starting air line should be shut.
A.stand-by engine B.full ahead C.finished with engine D.full away
