如图所示是人们用木棒撬石块�上�下用力都可以撬起石块这两种情况人们所用力的大小是 A.f上>f下b.f上=f下c.f上<f下d.无法 Template




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tomski如图所示是人们用木棒撬石块�上�下用力都可以撬起石块这两种情况人们所用力的大小是 a.f上>f下b.f上=f下c.f上<f下d.无法 coloring