问题
单项选择题
运算放大器应用电路如图所示，设其输出饱和电压为±11V，输入电压ui为正弦信号，则输出电压uo的波形为（）。
A.A
B.B
C.C
D.D
答案
参考答案：A
解析：
本题是运算放大器非线性特性知识的应用。
当uo=+11V时，Va=V+=1V，ui＞V+时，uo=-Uom；当uo=-11V时，Va=V+=-1V，ui＜V+，uo=-Uom。
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运算放大器应用电路如图所示，设其输出饱和电压为±11V，输入电压ui为正弦信号，则输出电压uo的波形为（）。
A.A
B.B
C.C
D.D
参考答案：A
解析：
本题是运算放大器非线性特性知识的应用。
当uo=+11V时，Va=V+=1V，ui＞V+时，uo=-Uom；当uo=-11V时，Va=V+=-1V，ui＜V+，uo=-Uom。
| 选择适当的单词填空，有两个单词是多余的。 | |
more and more students went there as volunteers. In 2007, Mei Chunjin 1______ Beijing went to Guangxi and worked in a small hospital as a student nurse. Yu Yiping, 2______ volunteer, began his work as a teacher in Jiangxi in 2008. He said he 3______ working there, but he had to 4______ after his parents in Jiangsu. He was so 5_________about that. Also in 2006, many students went to the west. One of them 6______ my cousin Liu Zhanglong. He would work in Tibet for four years as an office worker. He 7______ more student volunteers would go to the 8______ and help people there develop the west. |