All bilge suctions must be fitted with suitable （）, which in the machinery space would be mud boxes positioned at floor plate level for easy access.<br>A:strangers<br>B:relief valves<br>C:emergency valves<br>D:strainers

All bilge suctions must be fitted with suitable （）, which in the machinery space would be mud boxes positioned at floor plate level for easy access.
A:strangers
B:relief valves
C:emergency valves
D:strainers

出自：海船船员证

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