─ How are you? ─ _____ [ ] A. And you? B 发布时间:2017-05-17 15:00 │ 来源:www.tikuol.com 题型:选择题 问题: ─ How are you? ─ _____ [ ]A. And you? B. Fine, thank you. C. How are you?
题型:选择题 It was really a wonderful match. If only I it again.A.can watchB.will watchC.would have watchedD.could watch 查看答案
题型:选择题 如图所示的LC振荡电路,在某时刻的磁场方向如图所示,则下列判断不正确的是( )A.若磁场正在增强,则电场能正在减少,电容器上极板带正电B.若磁场正在减弱,则电场能正在增强,电容器上极板带正电C.振荡电流的变化周期为:2πD.电场能量的变化周期为:π 查看答案
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.mgtgθB.mgsinθC.μmgD.μmg 查看答案