题目内容

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

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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.

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斯通利波是一种界面波,传播速度高于井内流体速度。()