【判断题】The writer felt that her ankle was preventing her from running as well as she could.
【简答题】一些物体被摩擦后会带上 _________ ,用丝绸摩擦过的玻璃棒所带的电荷为 _________ 电荷,用毛皮摩擦过的橡胶棒所带的电荷为 _________ 电荷.带电的物体 _________ (填“能或不能”)吸引轻小物体.
【简答题】大量事实证明自然界只有______种电荷,人们规定用丝绸摩擦过的玻璃棒带的电荷为______,用皮毛摩擦过的橡胶棒带的电荷为______.
【判断题】It was not until she saw her name in lights that the writer felt sure that she was the Olympic champion.
【判断题】消化道肿块在胃肠钡餐检查中常表现为充盈缺损
【简答题】把用丝绸摩擦过的玻璃棒上所带的电荷规定为______电荷,把用毛皮摩擦过的橡胶棒上所带的电荷规定为______电荷.与用丝绸摩擦过的玻璃棒相吸引的带电体必与用毛皮摩擦过的橡胶棒相______,这个现象说明了自然界中只存在______种电荷.
【判断题】憎液溶胶在热力学上是不稳定、可逆系统。( )