健康证明书自签发之日起6个月有效。
Health certificates are valid for six months from the date of issuance.
检查证明书的日期是在一个有效的。
卖方或买方国家商会出具的不可抗力证明书将作为不可抗力发生及持续时间的充分有效证据。
Certificate issued by respective Chamber of Commerce of the Sellers' or the Buyers' country shall be sufficient proof ot such contingencies and their duration.
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