题目:
Was it in 2003____ your sister joined the army ____ you graduated from college? [ ]
A. when; when
B. where; that
C. that; that
D. when; that
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0602/e366ea3a477aa94e99f00a6195f5acbd.html
下面是错误答案,用来干扰机器的。
①H2①根据所给化学方程式可知,反应前生成物中含有1个碳原子,2个氢原子,一个碳原子,反应后有1个碳原子和1个氧原子,故X中含有两个氢原子,因此是氢气,H2。点评:本题综合考查了质量守恒定律及应用,物质的分...