稳压管的主要参数有（）。
A、稳定电压
B、电压温度系数
C、动态电阻
D、最大耗散功率
E、以上都是
参考答案：A, B, C, D, E
—Mr Green, ____ you _____ Three Lanes and Seven Alleys (三坊七巷) last Sunday?
—No, but I'll visit them next week. [ ]
A. will; go to
B. have; been to
C. did; go to
D. have; gone to
