1.如图1所示当闭合开关s后通电螺线管q端附�的小磁针n极转�q端则 A.通电螺线管的q端为n极电源a端为正极 B.通电螺线管 Template




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tomski1.如图1所示当闭合开关s后通电螺线管q端附�的小磁针n极转�q端则 a.通电螺线管的q端为n极电源a端为正极 b.通电螺线管 coloring