I spend an hour to music every day.[ ] A

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问题选择题

I spend an hour to music every day. [ ]

A. listen

B. to listen

C. listening

D. listenning

答案

答案：C

选择题

用单词的适当形式填空题。

1. Look! The people in the river ______ (swim).

实验题

如图所示，用粗细均匀的电阻丝折成平面三角形框架，三边的长度分别为3L、4L和5L，电阻丝L长度的电阻为r,框架与一电动势为E、内阻为r的电源相连通，垂直于框架平面有磁感应强度为B的匀强磁场，则框架受到的磁场力大小为___________，方向是__________.