同轴电缆和双绞线等传输媒体在OSI七层协议中属于物理层的范畴。（ ）
查看答案
多模光纤的信号传输性能优于单模光纤。（ ）
A. 对
B. 错
A compound complex sentence always
A. always ends in an exclamation point
B. has two or more independent clauses and one or more dependent clauses.
C. starts with a conjunction
We discussed about Autumn during this class
A. True
B. False
Today’s lesson had a videos about
A. football
B. autumn in the USA and one in China
C. being a millionaire
微信支付 
支付宝支付