气压机停机前,入口压力由()控制。
A、反飞动流量
B、气压机出口放火炬
C、气压机入口放火炬
D、入口风动闸阀
参考答案:C
The teacher asked a very difficult question. It was Ted who finally ____ a good answer.
A.came up with
B.kept up with
C.came up
D.caught up with
法是调整人们行为的一种规范。