The zener diode circuit is shown as figure, if VI =10V，R =100ohm，VZ =5V，IZ(min)=5mA，IZ(max)=50mA,T、then the reisitance of RL should be ( )A:> 111 ohm B:< 111 ohm C:> 111 k ohm D:< 111 k ohm 答案: > 111 ohm