以废旧产品作为生产毛坯，通过专业化修复或升级改造的方法来使用其质量特征不低于原有新品水平的制造过程称为（）。

A. to begin to occur or to exist
B. not working well
C. a short, quick movement

A. to create or write
B. to think about or consider (something) carefully
C. something that is very difficult to do

A. having a very close relationship
B. to move or control (something) with your hands or by using a machine
C. to find and look at information on the Internet

A. something that is very difficult to do
B. to begin to occur or to exist
C. to find and look at information on the internet