不属于跆拳道有效得分的部位是() A.胸部 B.头部 C.背部 D.腹部 发布时间:2018-03-27 17:22 │ 来源:www.tikuol.com 题型:单项选择题 问题: 不属于跆拳道有效得分的部位是()A.胸部B.头部C.背部D.腹部
题型:单项选择题 某氯原子的质量为a g,12C原子的质量为b g,用NA表示阿伏加德罗常数的值,下列说法中不正确的是( )A.y g该氯原子所含的电子数为17y/aB.x g该氯原子的物质的量一定是x/(a × NA)molC.1mol该氯原子的质量是aNA gD.该氯原子的摩尔质量为a g/mol 查看答案
题型:单项选择题 When asked to explain _____ he does to make his students so fascinated with his lessons, the teacher paused and thought deeply. [ ]A. what it is that B. that what it is C. what is it that D. that what is that 查看答案