题干

竖直向上抛出一小球,小球到达最高点时处于____状态(选填“平衡”或“非平衡”),你判断的依据是____.(忽略空气阻力)
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答案(点此获取答案解析)

非平衡,小球只受重力作用

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It was ________ of my secretary not to have let others disturb me this morning when I was occupied with my work.