Jeffery said he to the get-together the
题型：选择题
问题：
Jeffery said he to the get-together the next day, but he didn’t．
A．had come
B．would come
C．came
D．can come
题型：选择题
| 如图所示，AB是一质量为m的均匀细直杆，A端靠在光滑的竖直墙壁上，B端置于水平地面上，杆身与竖直方向夹角为θ，杆与地面的摩擦系数为μ，保持平衡，则此时杆与地面的摩擦力为（ ） A． B． C． D．μmg  |
mgtgθ
mgsinθ