锅炉正常运行氧量控制在多少？
参考答案：
控制在3.4%~4.25%。
—People now can know what is happening in the world quickly.
—You’re right.With the help of computers，news can ___every corner of the world.
A．get
B．reach
C．return
D．arrive
He is a successful business manager. His day is _____ business matters. [ ]
A. covered with
B. filled of
C. full with
D. filled with
