题目内容

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

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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。( )

斯通利波是一种界面波,传播速度高于井内流体速度。()

下面哪种岩性的时差最低()

A. 致密砾岩
B. 页岩
C. 砾岩
D. 泥岩