21.某同学自制了一个可以测人体重心位置的装置如图所示取一块与自己等长的木板·一端固定另一端用轻质细绳通过一个�轮悬挂起来�擦不 计 Template




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tomski21.某同学自制了一个可以测人体重心位置的装置如图所示取一块与自己等长的木板·一端固定另一端用轻质细绳通过一个�轮悬挂起来�擦不 计 coloring