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19 (需要写出计算过程)多级放大电路如图 2.14 所示,三极管的 β1=β2=80、rbe1=rbe2=1.6kΩ。 1)估算电路的输入、输出电阻 ri、ro; 2) 估算电路的源电压放大倍数 Aus; 3)若输入信号正弦波的最大值为 10mV,电路的输出电压的最大值是多少? 4)若电路中去掉射极输出器,而将信号直接接在放大电路的第二级进行放大,这时电 路的输出电压的最大值是多少? 5)比较 3)、4)的结果,可得出什么结论?
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【简答题】用所给词的适当形式填空。 1. The song _____ (remind) me of my childhood. 2. The boy didn't say the words _____ (clear), so his father could not understand him. 3. Of all the animals, I like _____ (monkey) best. 4....
【简答题】用所给词的适当形式填空。 1. The child ________ (stop) running around and read his English in the classroom. 2. The police ________ (be) happy to see that no one was hurt in the accident. 3. The boy ________ (run)...
【简答题】用所给词的适当形式填空，每空不限一词。 1. I think it's _____ (use) to talk with him. It's difficult to change his mind. 2. The terrible snowstorm kept them from _____ (ski) last week. 3. My uncle will come back from Lon...
【简答题】用所给词的适当形式填空 1. The man's _________(foot) are very big. It's hard for him to buy shoes. 2. It's easy to stay ___________(health). 3. I had a lot of ___________(headache) these days, so I should stay at...
【单选题】下列选项中,属于第一代头孢菌素特点的是( )。
A.
对革兰阳性细菌的作用抗菌强
B.
对革兰阴性杆菌较第三代弱
C.
对β-内酰胺酶稳定
D.
对耐药金葡菌有效
E.
对绿农杆菌有效
【单选题】下面程序的输出结果是【 】。 #include using namespace std; int fun(int a=1,int b=2,int c=3); int main() { cout< return 0; } int fun(int a,int b,int c) { return a*b*c; }
A.
6
B.
24
C.
12
D.
8
【简答题】用所给词的适当形式完成句子 . 1. It is said that it becomes the longest day when the _ (summer) comes. 2. They often help us to hold some _ (organize) s after school. 3. My brother wants to be a (history) so he...
【简答题】词汇运用 用所给词的适当形式填空，每空不限一词。 1. I think it’s ______( use ) to talk with him. It’s difficult to change his mind. 2. The terrible snowstorm kept them from______( ski ) last week. 3. My uncle will come back...
【简答题】用所给词的适当形式填空 小题1:His mother made him __________( clean ) all the rooms in two hours. 小题2:A good _______________( begin ) makes half success（成功）. 小题3:Do you know the ________(high)of Yao Ming? 小题4:Summe...
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