【单选题】— What were you doing when I rang you yesterday afternoon? — I was occupied ______ the housework and kept my daughter occupied ______ her homework. [ ]
【多选题】按照除菌方式的不同,可以将啤酒分为哪些类型?()
【简答题】( )的作用只是改变传动方向并不能改变传动比。
【单选题】— I rang you at about nine, But there was no reply. — Oh, that was probably ______ I was seeing the doctor. [ ]
【单选题】家具生产图比家具结构设计图主要多了哪一部分图纸内容?