问题
选择题
Sorry, I'm bus today.I have______ homework to do.[ ]
A. much too
B. too much
C. too many
C. many too
答案
答案：B
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Sorry, I'm bus today.I have______ homework to do.[ ]
A. much too
B. too much
C. too many
C. many too
答案：B
，0）由静止释放后沿直线PQ运动。当微粒到达点Q（0，-l）的瞬间，撤去电场同时加上一个垂直于纸面向外的匀强磁场（图中未画出），磁感应强度的大小
，该磁场有理想的下边界，其他方向范围无限大。已知重力加速度为g。求：