运算放大器的反相输入端用“-”号表示,其含义是()
A、只能输入负的直流电压
B、只能输入比同相端电位低的信号
C、只能输入低电平
D、输出端的极性与该输入端极性相反
参考答案:D
用所给的单词的适当形式填空。
1. I'd like _____ (talk) about the names in China.
2. He is one of the _____ (good) players in our school.
3. She gives me her techniques for _____ (learn) English.
4. The boy always strives _____ (do) everything well.
5. It's time for us _____ (sing) the song.
6. _____ (not be) nervous,Kate.
高压氧治疗气性坏疽采用_________疗法,即第1天治疗3次,第2天治疗_________次,第3天治疗_________次。治疗压力应取_________。