【简答题】A.Not use any electric appliances any more. B.Take part in a basketball final. C.Ask his neighbor to check the power. D.Watch a ball on television.
【单选题】( )we are ---- at what he said .what he sad is ----- .
【单选题】某阳离子X2+上网核外电子是18,中子数是20,则其质量数是( )
【简答题】A.Not use any electric appliances any more. B.Take part in a basketball final. C.Ask his neighbor to check the power. D.Watch a ball television.
【单选题】女生程某和男朋友租用一房屋,一天吵架后翻上窗台,大声喊叫“再吵就点火自杀”,邻居听到报警!房东知道后要求程某搬迁,并不退押金
【判断题】处于静电平衡的实心导体内部,电场强度处处为零