The starting air system usually has () to
问题:
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
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