若关于x的函数y=kx2+2x﹣1与x轴仅有一个公共点,则实数k的值为 . 发布时间:2017-05-06 14:18 │ 来源:www.tikuol.com 题型:填空题 问题: 若关于x的函数y=kx2+2x﹣1与x轴仅有一个公共点,则实数k的值为 .
题型:填空题 L1和L2灯上分别标有“6V 2W”和“6V 3W”字样,现在将L1、L2组成串联电路,则通过L1的电流______(选填“大于”、“等于”或“小于”)通过L2的电流,L1灯比L2灯______(选填“亮”或“暗”);如果把它们并联在一起,则L1灯比L2灯______(选填“亮”或“暗”). 查看答案
题型:填空题 This study website is really helpful, _____middle school students and parents can benefit a lot.[ ]A. which B. why C. from which D. of which 查看答案