1.选择题- (共3题)
1.如图(a)所示,在光滑水平面上用恒力F拉质量为m的单匝均匀正方形铜线框,线框边长为a,在1位置以速度v0进入磁感应强度为B的匀强磁场并开始计时,若磁场的宽度为b(b>3a),在3t0时刻线框到达2位置,速度又为v0,并开始离开匀强磁场.此过程中vt图象如图(b)所示,则( )

2.单项选择- (共4题)
4.
you turn off all the lights when you leave the classroom.
A.Making sure | B.To make sure | C.Being sure | D.Make sure |
5.
Though money, his parents still managed to send him to university.
A.lacked | B.lack | C.lacking | D.lacks |
6.
We can communicate________people in every part of the world ________the Internet.
A.with;with | B.with;through |
C.through;through | D.through;with |
试卷分析
-
【1】题量占比
选择题:(3道)
单项选择:(4道)
-
【2】:难度分析
1星难题:0
2星难题:0
3星难题:0
4星难题:0
5星难题:0
6星难题:4
7星难题:0
8星难题:0
9星难题:0