引起急性上呼吸道感染的主要病原为
A.细菌
B.病毒
C.真菌
D.衣原体
E.支原体
参考答案:B
In the police station, I saw the man from ___ room the thief had stolen the TV set.[ ]
A. whom
B. which
C. that
D. whose
负责GPRS网络中各网元产生的话单的收集、合并、预处理工作的网元是()
A.SGSN
B.GGSN
C.CG
D.APN