题型:判断题 用N A表示阿伏加德罗常数的值。下列说法一定正确的是A.1 mol苯乙烯中含碳碳双键数为4NAB.30 g 甲醛和醋酸的混合物中含碳原子数目为N AC.标准状况下,22.4 L空气含单质分子数目为N AD.0.5 mol Na2O2溶解于1 L水中得Na+的物质的量浓度为1 mol·L-1 查看答案
题型:判断题 – What a terrible collision accident! – Judging from the scene, personally, it is one or two car drivers, rather than the truck driver, who _____.A.is to blameB.are blamed C.are to blameD.is blamed 查看答案