启封火区时，火区的出水温度低于（）或与火灾发生前该区的日常出水温度相同。
A.30℃
B.25℃
C.20℃
参考答案：B
Nobody could tell me the way because _____ people were there in the night. [ ]
A. few
B. a few
C. little
D. a little
分组交换网中远程集中器（RCU）的功能是什么？
