字节同步浮动模式可直接从SDH信号流中提取（）Kb/s信号。
参考答案：64
—What is the matter?
—I have a ____. [ ]
A. sore throat
B. throat sore
C. ache head
D. a cold in the head
胶带的类型有哪些？各有何特点？
