题型:名词解释 — Why don't you go to medical college and be a doctor?— Oh.It calls for a great deal of________with long training, which I am afraid I don't have. [ ]A. strength B. energyC. wisdom D. patience 查看答案
题型:名词解释 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.mgtgθB.mgsinθC.μmgD.μmg 查看答案