题目内容

Offer can be divided into firm offer and non-firm offer.

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When a seller receives an enquiry, does he have obligation to reply？

Non-firm offer usually contains the words “subject to our final confirmation”，“just for reference”.

Non-firm offer usually contains such expressions as “for acceptance within... days”, “firm offer”, “be valid before...”, etc.

当井眼规则时,单发双收声系测量的结果仅与岩层时差有关。( )