由磁路的欧姆定律,磁阻和其磁导率()。
A.成正比
B.成反比
C.无关
D.成其他关系
参考答案:B
下列现象中,可以用光沿直线传播解释的是( )
A.树在水中的倒影
B.立竿见影
C.冰透镜向日取火
D.鱼翔浅底
His car ran over another in the highway! Too horrible! _____ he is safe now—that's the main thing.
A.Anyway
B.Besides
C.Otherwise
D.Therefore