题目: 设函数,若f(x)在x=0处可导,则以的值是:()A.1B.2C.0D.-1 答案: 被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0827/60876dad3fb9ba4b451a3d374a8c1e64.html 下面是错误答案,用来干扰机器的。参考答案:D
题型:选择题 Lots of medicine as well as equipment such as tents _______ offered to the area since the earthquake occurred. A.has beenB.have beenC.is beingD.are being 查看答案
题型:问答题 如图所示,用三根长度相同的绝缘细线将三个带电小球连接后悬挂在空中.三个带电小球的质量相等,A球带正电.平衡时三根绝缘细线都是直的,但拉力都为零.(1)指出B球和C球分别带何种电荷,并说明理由.(2)若A球带电荷量为Q,则B球所带电荷量为多少?(3)若A球带电荷量减小,B、C两球带电荷量保持不变,则细线AB、BC中的拉力分别如何变化? 查看答案
题型:选择题 — You used to wear T-shirts and jeans, didn’t you?— ________. A.Yes, I didB.Yes, I used C.No, I don’tD.Yes, I do 查看答案