Certificate issued by respective Chamber of Commerce of the Sellers' or the Buyers' country shall be sufficient proof ot such contingencies and their duration.
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。
2
Previously for these applicants, it was a requirement that the certificate IV alone was of at least one year's duration.
而此前仅就读四级证书一门课程，就必须至少一年时间。
3
The durationof validity for this certificate exceeds that of its certification authority.