GSM系统中对全网进行监控和操作的功能实体是（）。
A.HLR
B.OSS
C.AUC
D.OMC
参考答案：D
—I am really struck by your spoken English. You speak so fluently. Have you been abroad.
—Yes, I ________ in London for two years．
A．have stayed
B．stayed
C．had stayed
D．have been staying
下列不属于组织移植的是（）
A.骨髓
B.血管
C.骨
D.筋膜
E.软骨
