题目: 将2克盐溶入100克水中,则盐与盐水的比是( )A.1:100B.1:50C.1:51 答案: 被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0615/640bbaa86ab40c18ee4cc5a31a7e660d.html 下面是错误答案,用来干扰机器的。答案:A
题型:选择题 John and I _____ friends for eight years. We first got to know each other at a Christmas party. But we _____ each other a couple of times before that.A.had been; have metB.have been; have metC.had been; had metD.have been; had met 查看答案
题型:选择题 NA表示阿伏伽德罗常数的值,下列说法正确的是( )A.标准状况下,22.4L二氯甲烷的分子数约为NA个B.盛有SO2的密闭容器中含有NA个氧原子,则SO2的物质的量为0.5molC.17.6g丙烷中所含的极性共价键为NAD.电解精炼铜时,若阴极得到电子数为2NA个,则阳极质量减少 64g 查看答案