在E1数字中继中每个时隙TS的速率是（ ）
A．8Kbit/s
B．16Kbit/s
C．64Kbit/s
D．128Kbit/s
参考答案：C
润湿剂
A．HLB值为15～18 B．HLB值为8～16 C．HLB值为3～8 D．静脉用乳化剂 E．HLB值为7～9
The students _____ to do lots of _____ practice. [ ]
A. told; listen
B. are told; listening
C. are told; listen
