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

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

出自：海船船员证

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