问题
选择题
According to a survey, homework is_____ students most often blame for their lack of sleep.[ ]
A. what
B. that
C. which
D. why
答案
答案：A
搜题请搜索小程序“爱下问搜题”
According to a survey, homework is_____ students most often blame for their lack of sleep.[ ]
A. what
B. that
C. which
D. why
答案：A
2 CO2(g)+N2(g)。在密闭容器中发生该反应时，c(CO2)随温度(T)、催化剂的表面积(S)和时间(t)的变化曲线，如下图所示。
