题目

Some people think only school children do not agree with their parents, however, it is not true．Communication is a problem for parents anti children of all ages．If it’s hard for you to communicate with your parents, don’t worry about it．Here are some advice for you to bridge the generation gap (消除代沟)． Don’t argue (争辩)with your parents．Don’t get to your parents when you are angry．Your parents probably won’t consider your idea．If you are shouting at them, and you can’t express yourself well if you are angry．Go some place to cool off．Make sure you underst如图所示，质量为m的小球悬挂在小车顶棚上，在运动过程中当小球偏离竖直方向θ角时，则下列说法正确的是（ ）A.小车可能向左减速运动B.小车可能向右减速运动C.小车的加速度大小a=gtanθD.悬挂线的拉力大小F=