It was foolish of you to take a taxi ______you could walk there in five minutes.

A．if

B．as

C．how

D．when

基本尺寸是指在图纸上有设计给定的尺寸。它是根据零件的（）等所确定的数值。

A.强度

B.刚度

C.结构

D.工艺要求