题型:问答题 简答题 There was such a long queue for coffee at the interval that we ________ gave up.[ ]A. eventuallyB. unfortunatelyC. generouslyD. purposefully 查看答案
题型:问答题 简答题 有两个带电小球,电荷量分别为+Q和+9Q.在真空中相距0.4m.如果引入第三个带电小球,正好使三个小球都处于平衡状态.求第三个小球带的是哪种电荷?应放在什么地方?电荷量是Q的多少倍? 查看答案