一圆盘绕通过盘心且与盘面垂直的轴ο以角速度ω作逆时针转动,令将两大小相等,方向相反,但不在同一条直线上的力F和-F沿盘面同时作用到圆盘上,则圆盘的角速度
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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