单项选择题
A.compressed air B.electricity C.hydraulic oil D.compressing air
The starting air system usually has （） to prevent start...
单项选择题The starting air system usually has （） to prevent starting if anything is not in order.
A.stop valves B.interlocks C.non-return valves D.air vents
A.drain cocks B.vent valves C.counteracts D.interlocks
The space between cylinder liner and jacket is called （...
单项选择题The space between cylinder liner and jacket is called （）.
A.the cooling water B.the circulating water C.the cooler D.the cooling water space
