A gas-free certificate would usually be issued by a(n)（）.<br>A:ABS marine surveyor<br>B:certified marine chemist<br>C:port engineer<br>D:Coast Guard marine inspector

A gas-free certificate would usually be issued by a(n)（）.
A:ABS marine surveyor
B:certified marine chemist
C:port engineer
D:Coast Guard marine inspector

出自：海船船员证

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