The skillful design of the pulley block makes the largest door leaf able to bear the 400kg dead load of the leaf.

滑轮组的巧妙设计，使最大门扇可承受400公斤的门扇自重。

youdao

The skillful design of the pulley block makes the largest door leaf able to bear the 400kg dead load of the leaf.

滑轮组的巧妙设计，使最大门扇可承受400公斤的门扇自重。

youdao