A、A.A company should develop an ISM and implement it
B、B.A company implementing an ISM properly may obtain a DOC
C、C.Once a company obtains its DOC, each vessel of this company will obtain a SMC
D、D.DOC is valid for 60 months unless “major non-conformity” is found
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A、about which the vessel lists and trims B、which coincides with the center of buoyancy C、which，in the absence of external forces，is always vertically aligned with the center of gravity D、which is shown in the hydrostatic tables as VCB
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