1.繩子拉在上麵, 2.繩子的著力點和榫頭有兩寸的的距離.
再補充一點, 凳麵(懸梁)有一定的斜度, 斜度越大, 繩子的作用就越大.
1.繩子拉在上麵, 2.繩子的著力點和榫頭有兩寸的的距離.
再補充一點, 凳麵(懸梁)有一定的斜度, 斜度越大, 繩子的作用就越大.
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