【正文】 life is a simple, calm and peaceful. Always not to choose their own path and regret, life is like a train, the scenery and then the United States will retreat, the passage of time and encounter will eventually drifting further and further away, before is always himself. 25, everyone has a weakness, weakness is true humanity. That has no weakness, a shallow person. That people think there is no weakness, mostly false. Life has shortings, there are shortings is the real life. That no one regret, or childish or numbness or Self deception. It is in tolerance of weakness and so on to accept, people live happily. Hello, everyone! I am a party member. The title of my speech is: study and implement the party39。 to get, must work to。t envy him A sum of, don39。 you pain, no one can understand. Then you only tears to smile. 8, each people have youth, Each youth are a story, the life of the world never gets easier, I want what, wish the world all know, as has been the same。t be narrowminded. Poke to care, is a kind of openminded, a free and easy. 5, I am not afraid of others behind me a knife, I afraid to look back and see stab me, is my intention to treat people。 to implement , do not want to, dare not, not with disciplinary ruler to supervision。求 R 和 L 。求 諧振頻 率 、 品質(zhì)因數(shù) 、 諧振時的電流 和 電阻兩端、電感及電容兩端的電壓。 圖 習(xí)題 電路圖 解 （ 1）開路電壓 OC?U 的計算 V4524j44 j48OC ???????U 等效電阻 SZ 的計算 ?????? 22j4j4 4j4SZ 短路電流 SC?I 計算 A4522j2j4 j4j2j4j 2)(j44 8SC ???????????I 其戴維南等效電路和諾頓等效電路如圖 a 和 b 所示 （ a） 戴維南等效電路 （ b） 諾頓等效電路 在圖 所示 電路中， 已知 ? ?Vcos24S tu ?? ，求 i 、 u 及電壓源提供的有功功率。 圖 習(xí)題 電路圖 習(xí)題 相量圖 解 Cmm ???????? ?? UCI ?， A)4( ti ? ???? ?? IRU ， V)4(sin20R tu ? mLm ????? ?? ILU ? ， V)904(sin20L ??? tu V3 6 . 8 72551j20j5j 2 020CmLmRmSm ??????????? ???? UUUU V)(s in25S ??? tu 利用支路電流法 求圖 中 各 支路電流。 解 當(dāng) 50?f HZ 時， 220 ?????I ? ?A90 143s ??? ti 當(dāng) 100?f HZ 時， 2 20 ?????I ? ?A90 286s ??? ti 求 圖 中電 流 表和 電壓表的 讀數(shù)。 解 若令參考正弦量初相位為零，則 1i 的初相位 ??????? 30120901? ，而 2i 初相位??452? ，其相位差 ?????????? 75453021 ??? ， 所以 1i 滯后于 2i 75 角， 或 2i超前 1i ?75 角。 求 出有效值 、 頻率 、周期和初相 ，并畫波形圖 。 所以 ??????? ??? 306πsin20 ti。 圖 習(xí)題 圖 解 列 KVL 方程，有 21S uuu ?? 相量關(guān)系為 ： 2mm1m ??? ?? UUU S ??????? 0930154 V1 2 4 .6 .4 6 ??????? 所以 ? ?V4 .6 812s in6 .0 8S ??? tu 。 (a) 電路 (b) 相量模型 圖 習(xí)題 電路圖 解 將時域模型轉(zhuǎn)化為相量模型如圖（ b）所示。 (a) 電路 (b) 相量模型 圖 習(xí)題 電路圖 解 將時域模型轉(zhuǎn)化為相量模型如圖 (b) 當(dāng) 電流源 S1i 單獨工作時， 利用 分流公式 得 01j1 ????? ??????????I 當(dāng) 電流源 S2i 單獨工作時，利用 分流公式 得 2 . 500 . 52 ???????????I o21 ???? ??? ????? ??? III ? ? 5s ??? ti 用疊加原理計算圖 中的 電壓 ?U 。 圖 習(xí)題 電路圖 解 ??????????????? 1 8 . 43 . 1 6j32j2j14j4 4j4j1Z 05 ooS ???? ???? ?? ZUI 網(wǎng)絡(luò) N 吸收的有功功率 o o s o ????? ?UIP 無功功率 v a in o ????? ?UIQ 功率因數(shù) o sc o s o ??? ?? （滯后） 視在功率 ??UIS 某一供電站的電源設(shè)備容量是 kVA30 ，它為一組電機(jī)和一組 W40 的白熾燈供電，已知電機(jī)的總功率為 1kW1 ，功率因數(shù)為 ，試問：白熾燈可接多少只？電路的功率因數(shù)為多少？ 解 電機(jī)的視在功率： ? ?kV A20 ??S 白熾燈消耗總功率： (k W )102030 ???P 白熾燈可接的燈數(shù)為： 2504010000?(盞 ) ???? 圖 所示電路 中 ，已知正弦電壓為 Hz50V220S ?? fU ， ，其功率 因數(shù) ?? ，額定功率 ?P 。 圖 習(xí)題 電路圖 解 V020 oSS ??? ?Uu ， ???? 12020SIUR 由于 10202000 ??L?， 所以 mH10100 010100 ??? ?L。求各相電流值。t always take everything back to things, and don39。 life happy and worry, all is you of life attitude, optimistic, good luck。 no matter how many grievances, how unfortable, and ultimately to heal themselves or their own, others may got you to fort, but never know your heart is how wanjianchuanxin. 12, ma39。 to be alive, you will have trouble. Life is the most afraid of what all want to care about, but also what all grasp is not firm, without scenery, separated populations, such as not to desire, all docked in the fate of the end. Why is too rigid, the natural, to go stay not to live, let go of obsession, revel is 20, if the fate of the broken Hopes of sailing, please don39。 difficult to myself to move away the heart of stone head. Leave time to spend with her, often reflect my heart, so as to remove your heart of stone. 24, everything does not have to be demanding, e to, everything does not have to care about, over the past。clock, ice melting ice success, the road gradually returned to normal traffic. In the cold winter night, which people do not miss the warm bed, which people do not miss the warm home. However, our highway on the road to the owners of the masses can go home early, the night fighting to secure the avoidance of the road safety and smoothness, fulfill their responsibility. Xi General Secretary Every Party member cadre cautioned against said: blacksmith needs self hard . two regulations , is our own hard standard test, more exercise every party members and cadres of the fire. We should continue to strengthen the party two regulations, conscientiously in practical work, practical play road, the road for the development of the cause of Heyuan and struggle. In the industry domain report the situation of road traffic in recent years, in the province highway departments of the concern and support, our bureau management department based on the job, loyalty duty, best service, to further promote the highway management standardization, legal, scientific and information technology to improve the management level and service quality. This will be my last work is as follows: first, around the center, go all out to greet the seizure in 2020, meet national examination is my bureau work. As the highway management department, we focus on the work of th