I think of my father when I complain _____ trifles.
A. about
B. to
C. on
D. in
E. through
F. at
在DWDM系统发送端的OTM网元中,OTU板的out口一般会连接()。
A. OM板
B. OLA板
C. OD板
D. OTU板
I wondered whether dinner ready.
A. was
B. would be
C. had been
D. will be
在下列光网络拓扑形状中,自愈性最好的是()。
A. 链型
B. 网孔型
C. 环形
D. 星型