如图所示小明站在扶手电梯上匀速上楼可小明说自己没动他选择的参照物是 .在上楼过程中小明的重力势能 填“变大 “变小 或“不变 Template




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tomski如图所示小明站在扶手电梯上匀速上楼可小明说自己没动他选择的参照物是 .在上楼过程中小明的重力势能 填“变大 coloring