如图所示a为一根弹簧将它与电源相连当开关闭合后弹簧的长度将 A.变长b.变短 C.不变d.不能确定 题目和参考答案——青夏教育 Template




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tomski如图所示a为一根弹簧将它与电源相连当开关闭合后弹簧的长度将 a.变长b.变短 c.不变d.不能确定 coloring