在均匀磁场中,通过某一平面的磁通量为最大时,这个平面就和磁力线()。
A、平行
B、垂直
C、斜交
参考答案:B
函数y=lnx+2x-3的零点必定位于的区间是( )
A.(0,1)
B.(1,2)
C.(2,3)
D.(3,4)
When we _______the railway station, the train _______for 5 minutes.
A.got to, had been away
B.reached, had left
C.arrived, has been away
D.arrived at, has left