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- 1单摆的摆长为L,摆球质量为m,振动时最大摆角为θ,则单摆振动的机械能为___,摆球在平衡位置时的速率为____
- 2Sui Hai and Su Yang are twin sisters.Thay are in the same class and they l___ the same.
- 3甲、乙两站间的路程为450km,一列慢车从甲站开出,每小时65km;一列快车从乙站开出,每小时85km,两列火车
- 45分之3=( )÷15=20分之( )=( ) (填小数)
- 5boys and girls,after finish your homework,please hand _____ in .请问此处填it 还是them?
- 6求英语作文关于电视的
- 7Watching TV too much is _______(harm)to our eyes.
- 8九寨沟的景用什么成语来形容
- 9改错:Some people will live in a space station.
- 10沿着电场强度的方向,电势逐渐降低,那么从电势高的地方指向电势低的地方就是电场强度方向?