通电螺线管上方放一个小磁针小磁针静止时的指�如图所示则 A.a端为电源正极b.b端为电源正极 c.c端为通电螺线管s极 d.d端为通电 Template




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tomski通电螺线管上方放一个小磁针小磁针静止时的指�如图所示则 a.a端为电源正极b.b端为电源正极 c.c端为通电螺线管s极 coloring