下列哪种不属于常见的决策技术类型：
A、确定型决策
B、风险型决策
C、作战决策
D、非确定型决策
参考答案：C
甲圆与乙圆的周长比是2：3，则甲圆与乙圆的面积比是2：3．______．
The most widely used LAN system is ______ which adopts a form of access known as CSMA-CD．
A．Ethemet
B．ATM
C．FDDI
D．Wireless
