问题 单项选择题

关于理想集成运放特性,下列描述正确的是()。

A.开环差模增益无穷大,差模输入电阻无穷大

B.开环差模增益小,差模输入电阻无穷大

C.开环差模增益无穷大,差模输入电阻等于零

D.开环差模增益小,差模输入电阻等于零

答案

参考答案:A

材料分析题

莹莹是八年级2班的学生,她悄悄喜欢上了邻班的一个男生,他高大英俊,成绩优秀。一想起他,莹莹心中既甜蜜又自责……

阅读上述材料,回答下列问题:

(1)发生在莹莹身上的事情是否正常?为什么?

                                                                                                                                                              

                                                                                                                                                              

(2)她可以和他进一步发展这种感情吗?为什么?

                                                                                                                                                               

(3)男女生交往应注意什么?

                                                                                                                                                             

                                                                                                                                                            

计算题