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电压比较器输出电压与输入电压之间是 。
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反向过零比较器是参考电压为零且加在同向端，输入电压加在反向端。
同向过零比较器是参考电压为零且加在同向端，输入电压加在反向端。
B3U2 Expressions in useFill in the blanks with the expressions given below. Change the form where necessary. Each expression can be used only once.stop short plow through black out pull to a stoppop up grab for throw oneself into let oneself go1. When the busand I got off, I was relieved because I had finished school and I had the weekend ahead of me to enjoy myself.2. When my car crashed into the big tree, I could feel the blood draining from my face and I wondered whether I was about to .3. All kinds of questions concerning the soaring housing price begin toon cable television and the blogosphere (博客圈).4. The soldiers' rapid march wasby the general's command; they were uncertain whether to go back or forward.5. A car crashed into the side of a house after the driver lost control anda hedge (树篱).6. Charles reappeared, after half an hour's absence, andan armchair, where he lay back for some time with his eyes shut.7. No special equipment is needed other than inspiring, motivating music that you can dance passionately to and.8. As her door began to open, shethe telephone, and then dropped the receiver as Luke walked in.
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