Can you think of some cases ___ drivers obviously knew the traffic rules but didn’t obey them?

A．why

B．where

C．as

D．which

岩石在外力作用下纵向伸长，横向缩小，横向相对减小量与纵向相对伸长量之比被称为（）。

A.切变模量

B.泊松比

C.体积模量

D.杨氏模量