问题
单项选择题
A gas-free certificate would usually be issued by a (n)（）.
A.CCS marine surveyor
B.certified marine chemist
C.port engineer
D.HAS marine inspector
答案
参考答案：B
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A gas-free certificate would usually be issued by a (n)（）.
A.CCS marine surveyor
B.certified marine chemist
C.port engineer
D.HAS marine inspector
参考答案：B