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【单选题】
下列有关ISM规则要求的证书的叙述哪项不正确?A.
国际航行公司应同时持有有效的DOC副本和SMC
B.
船舶如不持有有效DOC的副本，则SMC视为无效
C.
如果船舶不持有有效的ISM证书，将成为港口国滞留船舶的理由
D.
DOC 和SMC的有效期均为5年，临时SMC有效期不超过12个月
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