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问题 单项选择题

IEEE802.16MAC层中，提供与更高层的接口，通过不同的会聚方式更好的适配各种上层协议指的是（）

A.公共部分子层

B.特定服务汇聚子层

C.安全子层

答案

参考答案：B

选择题

---Would you please tell me _________? 

--- In a small village near Niingbo.

A．where was your mother born

B．where your mother was born

C．when was your mother born

D．when your mother was born
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单项选择题

鉴幅测量系统是通过什么部件进行位移测量的（）

A.定尺绕组

B.磁性标尺

C.直流电动机

D.交流电机
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