下旋推挡在高点期或下降前期击球,击球时拍面要稍后仰,,向前下方用力()
A.触球的中下部
B.触球的中上部
C.触球的中部
参考答案:A
There _____ many students in the library after school every day. [ ]
A. has
B. have
C. is
D. are
服毒后洗胃时间最佳为()
A.12小时内
B.10小时内
C.8小时内
D.6小时内
E.8~10小时内