确定冲压工艺方案时需考虑的主要问题有()。
A.工序性质
B.工序数量
C.工序顺序
D.工序的组合方式
E.模具的结构形式
参考答案:A, B, C, D, E
The young man spent as much time as he __ over his lessons.
A.went
B.could go
C.could going
D.could to go
一般在目前市场上防冻液有哪几种规格?