钢筋冷弯试验的支辊间距应根据（）确定。

A.钢筋直径

B.现场样品

C.弯心直径

D.试验组数

The teacher wanted to know __________.

A．when was Linda born

B．if I was interested in math

C．what I will do with the computer

D．how many books have you got