题目内容：
单位体积岩石所受的重力称为 。
参考答案：
选择题：单位体积岩石所受的重力称为 。
- 题目分类：河南理工大学-采矿工程-井巷工程
- 题目类型：选择题
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_____ his help, he passed this exam.
_____ his help, he passed this exam.A Because ofB Due toC As a resultD But for
Mr. Smith had an unusual _________: He was first a
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