某同学在做测定木板与木块间的动�擦因数的实验时设计了两种实验方案.方案a木板固定用弹簧秤拉动木块.如图a所示.方案b木块固定用手 Template




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tomski某同学在做测定木板与木块间的动�擦因数的实验时设计了两种实验方案.方案a木板固定用弹簧秤拉动木块.如图a所示.方案b木块固定用手 coloring