-- Mike, how about your trip to South Hill?
-- Not very good. Because our car _______ on the way.
A:calmed down
B:turned down
C:broke down
D:put down
我国现阶段社会的主要矛盾是( )
如图所示,底面积相同的不同容器装有同种液体,且深度相同,则容器中液体对容器底压强最大的,是( )