【单选题】Mike pretended ___ Chinese when I came into the classroom.
【单选题】When I came into the classroom, I saw some girls _______ happily.
【简答题】She (clean) the window when I came into the classroom.
【单选题】Our English teacher the lesson when I came into the office.
【判断题】环控系统中的大系统是指车站公共区的空调通风系统。
【判断题】所谓车站小系统指的是车站公共区域(站厅、站台等)的空调、通风排烟系统。
【单选题】. .When I came into the classroom , I found him _______ with his study.
【简答题】用符号“ ¢ ” 或“ ∈ ” 填空: ( 1)−3 N , 0.5 N , 3 N ;