问题
选择题
Safety in school has been of great concern because of the frequent reports ________ students got
injured or killed while in school. [ ]
A. that
B. when
C. which
D. what
答案
答案：A
搜题请搜索小程序“爱下问搜题”
Safety in school has been of great concern because of the frequent reports ________ students got
injured or killed while in school. [ ]
A. that
B. when
C. which
D. what
答案：A
PCl3(g)＋Cl2(g)。当达到平衡时，混合气体相对于H2的密度为74.5，则PCl3(g)在平衡混合气体中所占体积分数是？简述计算过程。