OTN帧的第一个字段是()。
A. 帧对齐
B. 段监控
C. 通道监控
D. 串联监控
E. 误码监测
It is obvious that cleanliness in private spaces is often overlooked in a hotel.
A. True
B. False
C. Not given
D. Not sure
Children are not allowed to swim in the swimming pool.
A. True
B. False
C. Not given
D. Not sure
下面的合金中哪一个是热作模具钢()
A. Cr12MoV
B. 5CrMnMo
CrWMn
D. 4Cr13