花样滑冰运动员绕过自身的竖直轴转动,开始时两臂伸开,转动惯量为J0,角速度为ω0然后她将两臂收回,使转动惯量减少为1/3,J0,这时她转动的角速度变为
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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