句型转换

1. Pour hot water into the blender.(改为否定句)

    ______ ______ hot water into the blender.

2. I'd like three slices of beef.(对划线部分提问)

    ______ ______ slices of beef ______ you like?

3. He doesn't have any good friends in his class.(改为肯定句)

    He ______ ______ good friends in his class.

雨水管渠的设计降雨历时t，由地面降水时间t1和雨水在计算管段中流行的时间t2组成。其计算公式：t＝t1＋ｍt2计算时t1通常取值是（）。

A.3～5ｍin

B.5～8ｍin

C.5～12ｍin

D.5～15ｍin