Which of the following is true?（）<br>A:A company should develop an ISM and implement it<br>B:A company implementing an ISM properly may obtain a DOC<br>C:Once a company obtains its DOC, each vessel of this company will obtain a SMC<br>D:DOC is valid for 60 months unless “major non-conformity” is found

Which of the following is true?（）
A:A company should develop an ISM and implement it
B:A company implementing an ISM properly may obtain a DOC
C:Once a company obtains its DOC, each vessel of this company will obtain a SMC
D:DOC is valid for 60 months unless “major non-conformity” is found

出自：海船船员证

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