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小孩从滑梯上加速滑下,臀部有灼热的感觉,在小孩滑下的过程中,其动能 ,重力势能 ...
小孩从滑梯上加速滑下,臀部有灼热的感觉,在小孩滑下的过程中,其动能 ,重力势能 ,机械能 .
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A.
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B.
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C.
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D.
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下列电路连接没有错误的是( )
A.
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2C.W
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2D.W
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