—This new model bike _______ Uncle Wang last week.

—How beautiful! By the way, what’s it ________?

A．was made by; made of

B．was made; made from

C．was made to; make up

D．made by; made of

在使用氮气消除反萃取塔脉冲罐高液位报警时，若氮气压力不够，应改用工厂风。