单项选择题
This certificate is issued under the authority of the said Government，and it will remain in （） until Jan 1 2008.
A.strength B.power C.force D.stress
单项选择题 A vessel’s Classification Certificate is issued by the （）.
单项选择题 A vessel’s Derat Certificate is always issued by （）.
单项选择题 The certificate of pratique certifies that （）.
