细化要约邀请的规则，有利于约束要约邀请人即采购机关，使交易相对人确信交易机会存在。
Specializes the rules of invitation of offer will help to restrict procuring organs, thus ensuring the counterpart that there exist the transaction opportunities.
交易相对人能够以合理的价格从其他经营者获得同种商品或者替代商品的，不适用本条规定。
This article is not applicable if transacting parties are able to acquire the same kind of commodities or substitutes from other business operators at a reasonable price.
相反的，合同法第51条对相对人与交易安全的保护是很不利的。
On the contrary, article 51 is unfavorable for the protection of the third party and deal safety.
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