【单选题】关于磁场和磁感线,下列说法正确的是( )
D.
自由转动的小磁针放在通电螺线管内部,其N极指向通电螺线管磁场北极
【单选题】It's clear that the mainstream media have lost interest in classical music. For example, the NBC network used to have its own classical orchestra conducted by Arturo Toscanini, but no such orchestra e...
A.
whether popular taste has turned away from classical music
B.
whether newspapers are employing fewer writers on classical music
C.
whether the mainstream media have lost interest in classical music
【多选题】关于磁感应线和磁场,下列说法正确的是
C.
磁感应线的环绕方向与电流方向之间构成右手螺旋
【单选题】关于电场线和磁场线,下列说法正确的是( )
B.
磁场线是从磁体的 N 极发出,终止于 S 极
【单选题】For further detail, please ______ the last page of the newspaper. A. prefer to B. stick to C. refer to D. devote to
【单选题】关于磁感线和电场线,下列说法中正确的是( )
C.
磁感线起始于 N 极,终止于 S 极;电场线起始于正电荷,终止于负电荷
D.
磁感线和电场线都只能分别表示磁场和电场的方向
【单选题】What inspired Robert Owen to devote efforts into creating an safer workplace?
A.
possible profit from factories
B.
articles in the newspaper
C.
deplorable factory conditions
【单选题】What inspired Robert Owen to devote efforts into creating an idealistic workplace?
A.
possible profit from factories
B.
deplorable factory conditions
D.
articles in the newspaper
【单选题】体温持续在39~40℃以上,数天或数周,24小时内波动范围<1℃,为()