冲床一次行程内，在同一工位上完成两道以上工序的模具称为（）
A.冲孔模
B.连续模
C.复合模
参考答案：C
As we all know, every minute _____ full use of ____ our lessons will do good to us students.
A．which makes; studying
B．when made; to study
C．that is made; study
D．that is made; studying
荒漠化危害？
