的相位超前的45°电角。https://edu-image.nosdn.127.net/03CCBF374F7B1BF03CF7C3B3A22B8A5A.jpg?imageView&thumbnail=890x0&quality=100https://edu-image.nosdn.127.net/C64C02D59A2E184D388D4BC10DE1A688.jpg?imageView&thumbnail=890x0&quality=100

某晶体管的，，。当（）时，可以保证晶体管安全工作。https://edu-image.nosdn.127.net/99C6446C7430C77FB5607C729A992891.bmp?imageView&type=jpeg&thumbnail=520x520&quality=100https://edu-image.nosdn.127.net/ADE19E97708D53B439E98EDEA1AC7D1A.bmp?imageView&type=jpeg&thumbnail=520x520&quality=100https://nos.netease.com/edu-image/DB2387E22927FE0006A5419556C6B2E1.bmp?imageView&type=jpeg&thumbnail=520x520&quality=100

下列图片反映的共同主题是 三元里抗英 致远号撞向敌舰 义和团抗击八国联军https://edu-image.nosdn.127.net/1620C0E6AFD094E8FD6C400F85F5E239.jpg?imageView&thumbnail=890x0&quality=100https://edu-image.nosdn.127.net/EBBF68A946C000661CA2858E3E58764F.jpg?imageView&thumbnail=890x0&quality=100https://edu-image.nosdn.127.net/A3B51C26F0EB32A59576D7DD911A89BE.jpg?imageView&thumbnail=890x0&quality=100https://edu-image.nosdn.127.net/859A7A29F23FAF8E0BD0DA37CC361B52.jpg?imageView&thumbnail=890x0&quality=100

稳压管稳压电路如图所示，其中，，且具有理想特性。由此可知输出电压为 。https://edu-image.nosdn.127.net/673C255186FDCF88EDBAC49B07ADB1CB.bmp?imageView&type=jpeg&thumbnail=520x520&quality=100https://nos.netease.com/edu-image/0E53141787C336CC50F75AFDF7F0FE68.bmp?imageView&type=jpeg&thumbnail=520x520&quality=100https://nos.netease.com/edu-image/69E801A7EC054F71E15554043D89E990.bmp?imageView&type=jpeg&thumbnail=520x520&quality=100https://nos.netease.com/edu-image/CAD349EDF442F5664D9C0AD08B3FAACE.bmp?imageView&type=jpeg&thumbnail=520x520&quality=100

一个炔烃，分子式为，被氧化后，生成一种羧酸和，则这个化合物是。https://edu-image.nosdn.127.net/F1B5FF66EF3BF1B1B96AA9C6D0B8DA40.png?imageView&thumbnail=890x0&quality=100https://edu-image.nosdn.127.net/89A46112728ECF9C17813F3421EB752B.png?imageView&thumbnail=890x0&quality=100https://edu-image.nosdn.127.net/3CE7014CC41E9C98C9E669EB4E8AA352.png?imageView&thumbnail=890x0&quality=100

在图示电路中，开关S在t = 0 瞬间闭合，若 ，则的值为 。https://edu-image.nosdn.127.net/603FA3CFEE078FE23C1C1AB3CE9DA570.JPG?imageView&thumbnail=520x520&quality=100https://edu-image.nosdn.127.net/9375A351886F0559BABEB2C776258F45.JPG?imageView&thumbnail=520x520&quality=100https://edu-image.nosdn.127.net/E5769221F83FE03A5BD4FFD13AAE0AD1.JPG?imageView&thumbnail=520x520&quality=100

某三极管的极限参数，，若它的工作电压，则工作电流不得超过 mA。https://edu-image.nosdn.127.net/6084676B77A3D09BA6C966E3B2F6FE06.bmp?imageView&type=jpeg&thumbnail=520x520&quality=100https://nos.netease.com/edu-image/A8B6C32B9AEBFFC26D0EA05E546AD174.bmp?imageView&type=jpeg&thumbnail=520x520&quality=100https://nos.netease.com/edu-image/972FC77B3391BB3BF38CED03BC20A6C4.bmp?imageView&type=jpeg&thumbnail=520x520&quality=100https://nos.netease.com/edu-image/E0E53F335BD074C3CC13B5C7AF03908B.bmp?imageView&type=jpeg&thumbnail=520x520&quality=100https://nos.netease.com/edu-image/358494F4D729F0EF94D2F79DDEE623C0.bmp?imageView&type=jpeg&thumbnail=520x520&quality=100

图示电路中，已知R=400 Ω，XL =100Ω，XC =200 Ω，，则电源电压有效值为 V，初相位为 。（答案保留小数点后一位）https://edu-image.nosdn.127.net/6977AEA7D8A31D994BF396B51CEE9663.JPG?imageView&thumbnail=520x520&quality=100https://edu-image.nosdn.127.net/3C19B5D9F70BE3D96EBD384FEFEC409A.JPG?imageView&thumbnail=520x520&quality=100https://edu-image.nosdn.127.net/E4D86955B2583C2C705A670D0AAEA57E.JPG?imageView&thumbnail=520x520&quality=100

在如图所示的放大电路中，已知，，，，，，，、、足够大。晶体管的工作状态是 状态。https://edu-image.nosdn.127.net/F79A83E95AA17B78052432039DBBC254.bmp?imageView&type=jpeg&thumbnail=520x520&quality=100https://nos.netease.com/edu-image/D38B7739029B77E668AB870E65223EC1.bmp?imageView&type=jpeg&thumbnail=520x520&quality=100https://nos.netease.com/edu-image/5ECA665100B5E7810223A1ED6FB64C37.bmp?imageView&type=jpeg&thumbnail=520x520&quality=100https://nos.netease.com/edu-image/FC315751443B2C4A726FBD583ED15119.bmp?imageView&type=jpeg&thumbnail=520x520&quality=100https://nos.netease.com/edu-image/676B3BC6D6C1AEFA8C59C367506E8DF0.bmp?imageView&type=jpeg&thumbnail=520x520&quality=100https://nos.netease.com/edu-image/ABFFE0640249849738ED6A9F2A2850F0.bmp?imageView&type=jpeg&thumbnail=520x520&quality=100https://nos.netease.com/edu-image/FDB91D8F5266D1112E348BF33189B537.bmp?imageView&type=jpeg&thumbnail=520x520&quality=100https://nos.netease.com/edu-image/EEFE3428A09FF56552E0ACDD32F85625.bmp?imageView&type=jpeg&thumbnail=520x520&quality=100https://nos.netease.com/edu-image/5304BCBD9EE04F43D52B75EB47C419E7.bmp?imageView&type=jpeg&thumbnail=520x520&quality=100https://nos.netease.com/edu-image/EBAD862E88FCCCEFE9B726E67050C057.bmp?imageView&type=jpeg&thumbnail=520x520&quality=100https://nos.netease.com/edu-image/ED44A0B8A594AEFB705508FBB01608BA-1441449546094?imageView&thumbnail=520x520&quality=100

若将如图所示电路中的电容断开，则会引起 。https://edu-image.nosdn.127.net/EEE971517ED66810580F2657BDB3A3B1.bmp?imageView&type=jpeg&thumbnail=520x520&quality=100https://nos.netease.com/edu-image/97522CA91F6D831557DA8BF9DE046E01-1441447489780?imageView&thumbnail=520x520&quality=100