【简答题】填空题: 已知两个单管放大电路A和B的上、下限截止频率分别为 f HA =10MHz , f LA =100Hz , f HB =100MHz , f LB =10Hz 。把 A 和 B 连接成一个两级放大电路,则这个两级放大电路的上限截止频率 f H 约为 ,下限截止频率 f L 约为≈ 。
【多选题】(六)(B) 从方框中所给的A、B、C、D、E五个选项中选出可以填入空白处的最佳选项,完成对话。 Cathy: Hello! This is Cathy. Is Tom there? Jack: I’m sorry. 11 Cathy: Do you know when he’ll be back? Jack: 12 Sometime tonight, I guess. 13 Cathy: Yes...
A.
Would you like me to give him a message?
B.
Tom isn’t in right now.
C.
Please ask him to call me back as soon as he comes back.
【简答题】(B) 从方框中所给的 A 、 B 、 C 、 D 、 E 五个选项中选出可以填入空白处的最佳选项,完成对话。 Cathy: Hello! This is Cathy. Is Tom there? Jack: I’m sorry. 11 Cathy: Do you know when he’ll be back? Jack: 12 Sometime tonight, I guess. 13 Cat...