如图所示，无限长直导线在P处弯成半径为[img=14x19]1802ce3cb4be394.png[/img]的圆，当通以电流[img=8x19]1802ce3cbc893e1.png[/img]时，则在圆心[img=14x19]1802ce3cc44dff2.png[/img]点的磁感应强度的大小为 [img=638x324]1802ce3ccf12b07.png[/img]
A: [img=87x44]1802ce3cd7e2cd6.png[/img]
B: [img=33x44]1802ce3ce0081c3.png[/img]
C: [img=26x44]1802ce3ce832635.png[/img]
D: [img=9x18]1802ce3cf0930e6.png[/img]
E: [img=81x44]1802ce3cf8a8cbd.png[/img]
A: [img=87x44]1802ce3cd7e2cd6.png[/img]
B: [img=33x44]1802ce3ce0081c3.png[/img]
C: [img=26x44]1802ce3ce832635.png[/img]
D: [img=9x18]1802ce3cf0930e6.png[/img]
E: [img=81x44]1802ce3cf8a8cbd.png[/img]
举一反三
- 原电池（-）Pt︱Fe[img=17x22]1803dd54de61136.png[/img](1 mol·L[img=17x22]1803dd54e7299c0.png[/img]),Fe[img=17x22]1803dd54f0030fb.png[/img](1 mol·L[img=17x22]1803dd54fa39c0d.png[/img])‖Ce[img=17x22]1803dd5502f9d6b.png[/img]( mol·L[img=17x22]1803dd550b82a7d.png[/img]) ,Ce[img=17x22]1803dd55130efd2.png[/img]( mol·L[img=17x22]1803dd551af174c.png[/img]) ︱Pt(+)的电池反应是( )。 A: Ce[img=17x22]1803dd552375aee.png[/img] + Fe[img=17x22]1803dd552ca7541.png[/img] = Ce[img=17x22]1803dd5534dbdef.png[/img] + Fe[img=17x22]1803dd553dc33d1.png[/img] B: Ce[img=17x22]1803dd552375aee.png[/img] + Fe[img=17x22]1803dd553dc33d1.png[/img] = Ce[img=17x22]1803dd5534dbdef.png[/img] + Fe[img=17x22]1803dd552ca7541.png[/img] C: Ce[img=17x22]1803dd5534dbdef.png[/img] + Fe[img=17x22]1803dd553dc33d1.png[/img] = Ce[img=17x22]1803dd552375aee.png[/img] + Fe[img=17x22]1803dd552ca7541.png[/img] D: Ce[img=17x22]1803dd5534dbdef.png[/img] + Fe[img=17x22]1803dd552ca7541.png[/img] = Ce[img=17x22]1803dd552375aee.png[/img] + Fe[img=17x22]1803dd553dc33d1.png[/img]
- 如图所示的阻容耦合三级放大电路，第一级为 组态放大电路，第二级为 组态放大电路，第三级为 组态放大电路。[img=622x250]1803db3a87d1894.png[/img] A: CS，CE，CC B: CS，CC，CE C: CD，CE，CC D: CD，CE，CE
- 如图所示，无限长直导线在P处弯成半径为[img=14x19]1803aa9d3a78fb8.png[/img]的圆，当通以电流[img=8x19]1803aa9d423e689.png[/img]时，则在圆心[img=14x19]1803aa9d4a677b3.png[/img]点的磁感应强度的大小为 [img=638x324]1803aa9d544c33a.png[/img] A: [img=87x44]1803aa9d5ce7a96.png[/img] B: [img=33x44]1803aa9d6569075.png[/img] C: [img=26x44]1803aa9d6e3a6cf.png[/img] D: [img=9x18]1803aa9d769eaee.png[/img] E: [img=81x44]1803aa9d7f78f1c.png[/img]
- 19、不等式[img=129x24]18031ef3b487214.png[/img]的解集为{x|x＞3或x＜2}
- 应用Matlab软件计算行列式[img=110x88]17da5d7b00219d6.png[/img]为( ). A: x^2 - 6*x^2*y^2 + 8*x*y^3 - 3*y^4 B: x^3 - 6*x^2*y^2 + 8*x*y^3 - 3*y^4 C: x^4 - 6*x^2*y^2 + 8*x*y^3 - 3*y^4 D: x^5- 6*x^2*y^2 + 8*x*y^3 - 3*y^4