最新六脚自锁开关原理.doc

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1、__________________________________________________开关外观图如下图所示供电开关的原理图如下所示收集于网络，如有侵权请联系管理员删除__________________________________________________如图所示开关自锁键未按下时连接的是一边；按下自锁键后连接的是另一边。连接电路时中间的引脚一般都选择接入VCC。6脚自锁开关的相关数据如下8BU1Welcome语言点1I’vejusteatenit.我刚才把它吃光了。just可用于

2、完成时态中，置于动词与助动词之间，意为“刚刚”我刚刚做完家庭作业。I’vejustfinishedmyhomework.我刚刚给我的笔友写了一封信。I’vejustwrittenalettertomypenfriend.justnow刚才，相当于amomentago,用于一般过去时，通常位于句首和句末。刚才老师进教室了。Theteacherenteredtheclassroomjustnow.2You’vechanged,too.Youusedtobesokindtome.你也变了。你过去对我那么好。us

3、edtodosth过去常常做某事（=oftendidsthinthepast)过去我们常在一起打牌，下象棋。WeusedtoplaycardsandChinesechesstogether.我妈妈曾经是一位老师。Mymotherusedtobeateacher.这男孩过去常常放学后打篮球。Theboyusedtoplaybasketballafterschool.它的否定形式有两种：didn’tuseto/usednottousedtobe曾经是练习：I.首字母填空1.Mydaughterstudiedv

4、eryhardinthep.2.I’mafraidIcan’thelpyouatp.3.GreatchangeshavetakenplaceinTaizhous1949.收集于网络，如有侵权请联系管理员删除__________________________________________________4.Myfatheroftengotoworkbyu.5.Atthefashionshow,peopleworeclothesfromdifferentt.II.用所给词的正确形式填空1.Tomhastw

5、o(bowl)ofriceforlunch.2.Lindadidn’twant(listen)tothemusicagain.3.Wehavemealsthree(time)aday.4.There（be）someoldhousesneartheparkinthepast.5.Itisdangerous（play)withfire.III.请从各题后所给的A,B,C,D四个选项中选出最佳答案。1.I_____mybowlonthetableafewminutesago,butIcan’tfinditnow

6、.A.seeB.haveseenC.sawD.amseeing2.—Whydidyoudrinkmyjuice?—_______Iwasverythirsty.A.ForB.BecauseC.IfD.So3.Thetwinsareoverthere.Lucyisplaying_____volleyball.Lilyisplaying______Mimi,hercat.A.不填;不填B.with;withC.不填;withD.with;不填4.He_____alotovertheyears.Nowheisp

7、oliteandkind.A.changedB.haschangedC.ischangingD.changes5.Theundergroundhasbeeninuseinthecity_____2012.A.sinceB.onC.forD.at6.Myhomeisn’tfarfromschool,soI___toschooleveryday.A.driveacarB.takeabusC.rideabikeD.takeaplane7.—______isSimon?—Heiswateringflowersin

8、thegarden.A.WhatB.HowC.WhenD.Where8.WecangotoShanghaiby_______.Itisfasterandcansavemoretime.A.planeB.trainC.undergroundD.coach收集于网络，如有侵权请联系管理员删除