构成土的抗剪强度的基本要素是（）。
A.胶结力
B.分子引力
C.内摩擦力
D.粘聚力
参考答案：C, D
. In that country, the rich ______ richer, the poor, poorer.
A．become
B． has become
C．becomes
D．is becoming
前轮转向时前展角度一般规格为（）
A.0~1°
B.1~3°
C.2~4°
D.3~6°
