It was _______ she was injured in the accident _______ she didn’t come to the party yesterday.

A．as; which

B．because; that

C．since; why

D．for; that

在一定温度下，与纯液体处于平衡态时的蒸汽压力，称为该温度下的饱和蒸汽压。这里的平衡状态是指（）。

A.静态平衡

B.平衡

C.不确定

D.动态平衡