问题
选择题
The English play _____ my classmates acted at the new year's party was really a great success. [ ]
A. for which
B. at which
C. in which
D. on which
答案
答案：C
搜题请搜索小程序“爱下问搜题”
The English play _____ my classmates acted at the new year's party was really a great success. [ ]
A. for which
B. at which
C. in which
D. on which
答案：C
2ＮＯ２，2ＮＯ２
Ｎ２Ｏ４。所得混合气体中ＮＯ２的体积分数为40％，混合气体的平均相对分子质量。