根据题意得：n=22m+2=8，
解得：n=2m=3，
则n-m=2-3=-1．
We regret to ________ you that our library will be closed next Wednesday, Thursday and Friday for the
sports meeting.[ ]
A. say
B. speak
C. inform
D. notice
ZPW-2000A型无绝缘移频自动闭塞发送器移频信号如何产生？
