如图所示为半径是R的无限长均匀载流圆柱面，下面哪个图正确描述了磁场B 随轴线距离r的变化关系？
图1 图2 图3https://edu-image.nosdn.127.net/31D27CA08DC91CE2051DCD38E470FCF9.png?imageView&thumbnail=890x0&quality=100https://edu-image.nosdn.127.net/5680B1AEE5D4958AB494DDFB03DB9AC8.png?imageView&thumbnail=890x0&quality=100https://edu-image.nosdn.127.net/9A79EB32C85DADDFBD26CA3FEAB87697.png?imageView&thumbnail=890x0&quality=100https://edu-image.nosdn.127.net/539A680A51056EA932C3B53F07B31247.png?imageView&thumbnail=890x0&quality=100
图1 图2 图3https://edu-image.nosdn.127.net/31D27CA08DC91CE2051DCD38E470FCF9.png?imageView&thumbnail=890x0&quality=100https://edu-image.nosdn.127.net/5680B1AEE5D4958AB494DDFB03DB9AC8.png?imageView&thumbnail=890x0&quality=100https://edu-image.nosdn.127.net/9A79EB32C85DADDFBD26CA3FEAB87697.png?imageView&thumbnail=890x0&quality=100https://edu-image.nosdn.127.net/539A680A51056EA932C3B53F07B31247.png?imageView&thumbnail=890x0&quality=100
举一反三
- 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
- 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
- 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
- 某独立基础X向的尺寸为1500，Y向的尺寸为2000，底板配筋集中标注为“B：X 10@200 Y12@200”， 一个独立基础下料时，X向的10要下多少根？https://edu-image.nosdn.127.net/231089C118D2420C2181AA76D44595DC.png?imageView&thumbnail=890x0&quality=100https://edu-image.nosdn.127.net/231089C118D2420C2181AA76D44595DC.png?imageView&thumbnail=890x0&quality=100https://edu-image.nosdn.127.net/231089C118D2420C2181AA76D44595DC.png?imageView&thumbnail=890x0&quality=100
- 中国大学MOOC: 在上述生成https://edu-image.nosdn.127.net/5BB093A91DB4F39A9028F1A7F0BB1109.png?imageView&thumbnail=890x0&quality=100的所有置换的问题中，在搜索树的结点https://edu-image.nosdn.127.net/96D39D5A00286295D7494FEDEB848882.png?imageView&thumbnail=890x0&quality=100处，https://edu-image.nosdn.127.net/1F95EC365E24DFB1277C991DEECA2877.png?imageView&thumbnail=890x0&quality=100的取值范围https://edu-image.nosdn.127.net/34C6A401146D9611BAB32A8D597DE8AC.png?imageView&thumbnail=890x0&quality=100（ ）。