正反馈主要用于振荡电路，负反馈主要用于放大电路。()
查看答案
The word "capillary", as used throughout the text, means "______".
A. objects having a similar size and shape to hairs
B. blood vessels
C. any tubular object having a small internal diameter
D. contact brushes in microchips
It can be learned from Paragraph 4 that______.
A. private oil companies, non-OPEC countries and governments are powerless
B. OPEC needs to increase the refining capacity
C. everyone should be more focused on geopolitics
D. OPEC can not be solely responsible for increasing refining capacity
共阴极的半导体数码管应该配用高电平有效的数码管译码器。()
同相比例运算电路中集成运算放大器的反相输入端为虚地。()
微信支付 
支付宝支付