—The head teacher said we had only three days to finish the project.

—Don't worry. We have already ________ two thirds of it.

A．taken over

B．given away

C．made up

D．got through

埋弧焊的主要优点有（）

A.电流输出功率大，热效率高

B.生产效率高

C.自动化程度低

D.没有电弧光辐射，劳动条件好