题目:
.—Why not _______us and have a good time at the party?
---I would love to. ________ I have a lot of homework to do.
A.join in , But
B.take part in, And
C.join, And
D.join. But
答案:
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ACD 穿过闭合电路的磁通量发生变化题目分析:当闭合开关瞬间,电流从无到有,则线圈B有磁场,导致线圈A的磁通量增大,从而产生感应电流,当开关断开的瞬间,电流从有到无,则线圈B的磁场从有到无,导致线圈A的...