以下不属于无线网络规划仿真工具是（）。
A.AiRCom
B.Atoll
C.Coyote
D.plANet
参考答案：C
It is bad manners for you to make _____ fun of the disabled; you should know they are in ______ need of our understanding.
A．a; a
B．a; /
C．/; a
D．/; /
测量误差从总体上讲有（）来源。
A.2个
B.3个
C.4个
D.5个
