采购单由采购经理签署后，提交给核质量保证工程师（NQA）进行评审、核准和背书。
The purchase order will be signed by the Procurement Manager prior to forwarding for review, approval and endorsement by the NQA Engineer.
背书必须书于汇票本身，并由背书人签署。
Article29 an endorsement shall be signed and the date of endorsement specified by the endorser.
背书必须书于汇票本身，并由背书人签署。
Article29 an endorsement shall be signed and the date of endorsement specified by the endorser.
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