問題詳情:如圖*為電熱毯的電路圖,把電熱毯接在U=311sin100πtV的電源上,電熱毯被加熱到一定溫度後,通過裝置P使輸入電壓變為乙所示的波形,從而進入保溫狀態,若電熱絲電阻保持不變,此時交流電壓表的讀數是:________.【回答】156V解析:電壓表的示數為有效值據有效值的定義有:·T=·∴U===1...
2019-05-04 28192
經典語錄佐藤·達廣(男主):”現在你只是在逃避,沉浸在美妙的夢幻中,不敢正視現實。“小林·友(小林·惠的歐尼):”沒想到會被你說教。“佐藤·達廣:”什麼?“小林·友:“說到不敢正視現實,你我都一樣吧。今後該怎麼做,怎麼做才能好轉,其實心裡都明白。自我啟發書已經讀了兩百多本,自己也...
2017-02-04 28598
問題詳情:Childrenshouldn'twatch TV. A toomany B.toomuch C.muchtoo D.many【回答】B知識點:相似相近詞比較題型:選擇題...
2021-10-09 13897
問題詳情:Wearebusywiththemid-termexam,sowehavenotime TV theeveningofNov.16. A.towatch;on B.towatch;in C.watching;on D.watching;in【回答】A知識點:相似相近詞比較題型:選擇題...
2019-10-29 9264
問題詳情:一個矩形線圈在勻強磁場中轉動,產生的感應電動勢e=220sin100πtV,則() A.交流電的頻率是100πHz B.t=0時,線圈位於中*面 C.交流電的週期是0.02sD.t=0.05s時,e有最大值【回答】考點: 交流發電機及其產生正弦式電流的原理;正弦式電流的最大值和有效值、週期和頻率....
2020-12-13 31662
問題詳情:我國家庭照明電路用的交流電的電壓瞬時值隨時間變化的規律為u=311sin100πtV,關於此交流電下列說法中正確的是A.電壓的最大值是311VB.電壓的有效值是311VC.交流電的頻率為100HzD.交流電的週期為100s【回答】A知識點:(補充)表徵交變電流的物理量題型:選擇題...
2020-05-30 23738
ThecolourTVsetonlycosts800yuan.AuntWangisplanningtobuyacolourTVsetnextmonth.ModelBeijing839colourTVsetmodifiedintotri-systemmonitor.Byusingeconomyinbuyingfoodandclothes,wewereabletosaveenoughmoneyforanewcolourTVset.Generallyspeaking,peoplelikecolourT...
2022-04-21 14848
1、WhocareswhathappensonrealityTV,whenrealityisslippingbyoutside?2、JadeGoody,arealityTVstar,diedonMarch22nd,aged27.3、LethertrytosuddenlywriteaboutrealityTVormodelsorCharlieSheen.4、WatchrealityTVshowsthatinvolverealhousewives,dancingC-listcelebriti...
2023-12-29 28309
問題詳情: When I was young, I watch TV whenever I wanted to. A. should B. could C. must D. need【回答】B知識點:虛擬語氣與情態動詞題型:選擇題...
2020-12-15 7892
經典語錄一生敗在太沒錢,不敢愛她太明顯。...
2018-02-01 19100
Eachroomisequippedwitha32inchLCDTVsettoprotectyourvision.Thestimuluseffectisfadingasmostcustomersinruralmarketscan'taffordtobuymorethanoneLCDTVset....
2018-12-12 14484
問題詳情:TVturnoffweek,________millionsofpeoplearoundtheworldparticipateeveryyear,triestoencouragepeopletoturnonlife.A.inwhich B.onwhichC.which D.when【回答】A考查定語從句。which引導定語從句,“每年世界各地數以百萬計的人們參加TVturnoffweek這一活動”...
2022-08-08 14923
問題詳情:a為某型號電熱毯的電路圖,將電熱絲接在u=156sin120πtV的電源上,電熱毯被加熱到一定溫度後,由於P的作用使輸入的正弦交流電僅有半個週期能夠通過,即電壓變為圖b所示波形,從而進入保溫狀態.則此時交流電壓表( )A.測量的是電壓的最大值,讀數是156V B.測量的...
2021-02-25 31771
問題詳情: Hisaunt TV. A.likewatch B.likeswatching C.likeswatch 【回答】B 知識點:動詞和動詞短語題型:選擇題...
2020-09-26 20265
問題詳情:如圖所示,一正弦交流電瞬時值為e=220sinl00πtV,通過一個理想電流表,接在一個理想變壓器兩端,變壓器起到降壓作用.開關閉合前後,AB兩端輸出的電功率相等,以下說法正確的是 A.流過r的電流方向每秒鐘變化50次 B.變壓器原線圈匝數小於副線圈匝數 C.開關從斷開到閉合時,電流...
2019-12-06 12592
satelliteTVgroundreceivingstationButcableandsatelliteTVbreezedthrough.IncaseofsatelliteTVbroadcasting,asatelliteTVbroadcastingsystemcoveringthewholeworldandasatelliteTVeducationsystemcoveringthewholecountryhavebeenestablished.Chinahasabout189,000sate...
2017-11-08 29478
問題詳情:Have you ever seen the TV show “where are we going, Dad?” It is now without doubt the most popular TV show in China, attracting over 600 million viewers each week. In this program, several fathers,61 are...
2019-09-07 27028
問題詳情:如圖所示為電熱毯的電路圖,電熱絲接在u=311sin100πtV的電源上.電熱毯被加熱到一定溫度後,通過裝置P使輸入電壓變為圖(b)所示波形,從而進入保溫狀態.若電熱絲電阻保持不變,此時交流電壓表的讀數是( ) ...
2020-04-24 30207
問題詳情:流域的開發都以河流的利用與治理為核心,結合流域的具體特徵,對資源進行綜合開發和利用。據此完成3~4題。3.TVA(田納西河流域管理局)主要負責田納西河流域的統一開發和管理,它所確定的流域開發的核心是()A.河流的梯級開發B.流域的綜合開發C.流域生態環境的恢復和治理D.防洪...
2020-11-17 32396
問題詳情:如圖所示,理想變壓器原線圈a、b兩端接正弦交變電壓u,u=220sin100πt(V),電壓表V接在副線圈c、d兩端(不計導線電阻).則當滑動變阻器滑片向右滑動時A.電壓表示數不變B.電流表A2的示數始終為0C.若滑動變阻器滑片不動,僅改變u,使u=220sin200πt(V)則電流表A1的示數增大D.若滑動變阻...
2020-02-07 19106
問題詳情:HesoccerballonSundayTV. n’tplay;watches’tplay;watchesn’tplay;doeswatch’tplay;watch【回答】A知識點:相似相近詞比較題型:選擇題...
2020-05-31 16570
問題詳情:—Doesyourfatherplaysports?—No,heonlywatchesTV. in on on in【回答】B知識點:相似相近詞比較題型:選擇題...
2019-11-01 9016
distributionequipment[cableTV]IfthecableTVinembarrassingposition?B:Sure.DoyouhavecableTVinChina?AusefulanalogyisthefamiliarcableTVbox.CanyouinstallcableTVonmyPC?Forone,thecableTVindustryhasyettogetonboardwiththenewdigitalTVstandards.Legalinstitutions...
2017-11-03 18952
問題詳情:一臺旋轉電樞式交流發電機,在正常工作時的電動勢e=220√2sin100πt(V),由於超負荷使得電樞轉速降低了1/10,這時的電動勢是( )A.e=220√2sin100πt(V) B.e=220√2sin90πt(V)C.e=198√2sin100πt(V) D.e=198√2sin90πt...
2020-04-23 18605
Occasionallyastarsellerwillgetaprizelikea50-inchplasmaTV.S.studythatfoundthreeoffourwomenwouldpreferanewplasmaTVtoadiamondnecklace.AllguestroomsarefurnishedwithSheratonSweetSleeperbedSM,broadbandinternetaccessandflatscreenplasmaTV.Thestudyfound77perce...
2017-02-19 9000