以兹为证，双方共同签订本合同，正本两份，双方各执一份。
In WITNESS THEREOF this contract is signed by both parties in two original copies; each party holds one copy.
对检测合同内容的任何变更均须以书面方式进行。由签订本合同的客户代表和承检方代表共同签字确认后方为有效。
The contract may only be modified by a variation expressed in writing, signed and confirmed by the client and the tester on behalf of.
本合同由买方和卖方共同签订。
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