题目内容

有效应力σ′、孔隙水压力u之间存在的关系为:

A. σ=u-σ′
B. σ′=u-σ
C. σ′=σ-u
D. σ′=σ+u

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What is cardiopulmonary resuscitation ?

How many kinds of CPR are there?What are they, respectively?

A. One type is the use of “hands and month breathing CPR”.
B. The other type is the use of “Hands-Only CPR”.

When is CPR needed by the patient?

CPR is not difficult to learn. Everyone can learn and apply to it.

A. 对
B. 错

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