LFG tank and pipeline maintenance should include（）.<br>A:exclusion of all sand and solid matter<br>B:cleaning with clean fresh or sea water<br>C:examination for fractures and pitting<br>D:All of the above

LFG tank and pipeline maintenance should include（）.
A:exclusion of all sand and solid matter
B:cleaning with clean fresh or sea water
C:examination for fractures and pitting
D:All of the above

出自：海船船员证

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