如图所示.借助该装置小文用150n的力将重为600n的�托车拉高2米.此过程小文做功 j该装置的机械效率为 .——青夏教育精英家教�—— Template




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tomski如图所示.借助该装置小文用150n的力将重为600n的�托车拉高2米.此过程小文做功 j该装置的机械效率为 .——青夏教育精英家教�—— coloring