下列哪种方法不属于概率抽样方法
A．单纯随机抽样
B．整群抽样
C．方便抽样
D．系统抽样
E．分层抽样
参考答案：C
—What a nice MP5! Whose is it?
—It's _____. My father bought it for me. [ ]
A. me
B. him
C. his
D. mine
TD一SCDMA系统的网络结构有哪几部分组成（）.
A、用户识别模块域
B、移动设备域
C、无线接入网域
D、核心网域
