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SectionD-1Volunteersareourheartandsoul.Pleasecomeandhelpusbuildhomesfor___1___low-incomefamilies.Thereisnoexperienceneededandwesupplythe____2____.Justvolunteerforaday.It’sfun,rewardingandyoucanlearnsome____3____.Ifbuildingisn’tyourthing,comeandvolunteerforoneofoureventsor____4____.Youmustbe____5____14yearsofagetovolunteerandthose15yearsandundermustcomewithaparent.Comeandsignupnowtovolunteeryourtime.

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A. 涩
B. 鲜
C. 甜
D. 甘

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A. 对
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A. 对
B. 错

RC微分电路应具有两个条件:(1)时间常数(远大于或远小于)脉冲宽度;(2)电压从两端输出。

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