The starting air system usually has （） to prevent starting if anything is not in order.<br>A:stop valves<br>B:interlocks<br>C:non-return valves<br>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

出自：海船船员证

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