问题
选择题
You should look left and right when you go _____ the road. [ ]
A. across
B. through
C. over
D. past
答案
答案：A
搜题请搜索小程序“爱下问搜题”
You should look left and right when you go _____ the road. [ ]
A. across
B. through
C. over
D. past
答案：A
的小球由静止释放，小球的运动轨迹为一直线，此直线与竖直方向的夹角为θ，则匀强电场E的最小值是
