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

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单项选择题

A.drain cocks
B.vent valves
C.counteracts
D.interlocks

单项选择题

A.the cooling water
B.the circulating water
C.the cooler
D.the cooling water space

单项选择题

A.the circulating tank
B.the scavenge box
C.the cooling water space
D.the cooler