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根据需要起源不同，可将其分为（）

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形成掌深弓的是（）

货物质量不符合国家的有关法规、质量标准以及合同规定的产品适用安全和其他特性的要求，给用户造成损失后，由产品的生产者和经销者所承担的民事责任的是（）。

根据下列选项，回答 46～50 题。
Documentarv credits are separate transactions from the contract of sales with which they are related．In documentary credits 1 are concerned only with documents，and their decision whether or not to pay，accept or negotiate under a credit depends solely on whether the documents presented confirm to the terms and conditions in the 2．When the beneficiary submits documents that contain discrepancies or errors，the banks will reject the documents and return them to the 3 for resubmission after corrections．Seen from a different perspective，even if the importer becomes bankrupt after the shipment，the beneficiary is entitled to payment by the issuing bank as long as he is able to present the correct 4 stipulated in the credit．That banks deal only with documents and not performance of the 5 is key to the operation of documentary credits．
第 46 题请在1处填上正确答案

生物体内环境稳态是指（）。