I don't trust that man; he is the guy who ____. [ ]

A. never eat his word

B. never keeps saying

C. always eats his words

D. keeps his word

通常用来控制土的夯实标准的岩土物理力学性能指标是（）。

A.黏聚力

B.密实度

C.干密度

D.可松性