如图甲所示为古人巧妙应用杠杆的智慧结晶——舂,当人用力踩横木一端时,松脚后横木绕某点转动,另一端碓头下落,击打石臼内的谷物。图乙是用力踩在横木 Template


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tomski如图甲所示为古人巧妙应用杠杆的智慧结晶——舂,当人用力踩横木一端时,松脚后横木绕某点转动,另一端碓头下落,击打石臼内的谷物。图乙是用力踩在横木 coloring