第15题:[多选题]晶体三极管的主要参数有( ) A. 电流放大倍数 B.反向饱和电流 C. 穿透电流 D.集电极—发射极击穿电压 E.功率 F. 以上答案均正确 参考答案:ABC
第16题: [单项选择]Questions 19 to 22 are based on the conversation you have just heard. A. A player of background music. B. A researcher on the function of background music. C. A composer of background music. D. A fan of background musi 参考答案:C 答案解析:[听力原文] 19-22 W: What are you working now M: (19)I’ve just finished a piece of background musi