1,月球绕地球一周多久?选b,28天 2,地球绕轴心转一圈（自转一周）多久?没选项,是24个小时,24hours 3,为什么铜通常用作导线?选b,铜导电 建议你通读《十万个为什么》
英语翻译1:how long does it take the moon to travel once around t
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