题目内容

关于对电场线的理解,下列说法中错误的是:( )

A. 电场线是人们为了描述电场的分布特征而人为引入的,并不真实存在
B. 静电场的电场线总是从正电荷出发,到负电荷终止,在真空中不会中断
C. 可以用电场线的疏密程度来描述电场的强弱
D. 可以用电荷的受力方向来描述电场线的方向

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One of the unique aspects about Group Exercise is the ______ of music and exercise.

A. combine
B. combination
C. connection

________ provides membership privileges to young individuals being under the age of 21 or under 25.

A. Junior membership
B. Singles membership
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C. Belly dance
D. Aerobics

As an group exercise instructor, you need to be able to find the _____ and stick with it.

A. beat
B. music
C. motion