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
C. family membership

_______ is a conditioning routine that may help build flexibility, muscle strength, and endurance in the legs, abdominal, arms, hips, and back.

A. Yoga
B. Pilates
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

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