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.
我们的证明书以盖公章有效。
肇事直升机的飞行员具备有效的航空运输飞行员执照（直升机和自转旋翼机）和一级体检合格证明书，并拥有3 ， 900小时的飞行经验。
The pilot held a current airline transport pilots licence ( helicopters and gyroplanes ) and a valid class one medical certificate. he had 3, 900 hours of operating experience.
肇事直升机的飞行员具备有效的航空运输飞行员执照(直升机和自转旋翼机)和一级体检合格证明书，并拥有3,900小时的飞行经验。
The pilot held a current airline transport pilots licence (helicopters and gyroplanes) and a valid class one medical certificate. He had 3, 900 hours of operating experience.
肇事直升机的飞行员具备有效的航空运输飞行员执照(直升机和自转旋翼机)和一级体检合格证明书，并拥有3,900小时的飞行经验。
The pilot held a current airline transport pilots licence (helicopters and gyroplanes) and a valid class one medical certificate. He had 3, 900 hours of operating experience.
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