下列关于加速度的说法中，不正确的是（ ）
A．加速度不为零时，其速度一定发生改变
B．加速度为零时，物体一定处于静止状态
C．物体的速度变化越快，加速度越大
D．物体的加速度减小，速度可能增大
A、加速度不为零时，物体速度一定发生改变．故A正确．
B、加速度为零时，物体处于静止状态或匀速直线运动状态．故B错误．
C、加速度表示物体速度变化的快慢，物体的速度变化越快，加速度越大．故C正确．
D、物体的加速度减小，当速度与加速度方向相同时，速度增大．故D正确．
本题选错误的，故选B
A hot dog is one of the most popular American food. It was named after frankfurter, a German food. You may hear “hot dog” ______ in other ways. People sometimes _____ “hot dog” to express pleasure(快乐). For example, a friend may ask if you would like to go to the cinema. You____ say, “Great. I’d love to. ” Or, you could say”______! I’d love to go.” People _____ use the expression（表达） to describe someone who is a “show-off”, who tries to show everyone else how ____ he is. You often hear such a(n) _____ called a “hot dog”. He may be a basketball player, for example, who _____ the ball with one hand making a(n) ___ catch seem more difficult. You know he is a “hot dog” because when he makes such a catch, he bows(鞠躬) to crowd, hoping to _____ their cheers.
|
