题型:选择题 设NA表示阿伏加德罗常数的值,下列叙述中正确的是( )A.标准状况下,NA个SO3分子所占的体积约为22.4LB.在标准状况下,1L庚烷(C7H16)完全燃烧所生成的气态产物的分子数为7/22.4NAC.16.9g过氧化钡(BaO2)固体中阴、阳离子总数约为0.3NAD.7gCnH2n中含有的氢原子数目为NA 查看答案
题型:选择题 -I will allow you to use my computer if you can finish your homework before 4 o'clock today. -Is that a_______? I'm sure I can make it.A.chanceB.promiseC.trickD.treat 查看答案