pulleys of metal 中文意思是什麼
pulleys of metal
解釋
金屬滑輪-
Lifts and service lifts. rules for the design of the metal frame work bearing either the hoist or the guide pulleys
載客電梯和貨梯.傳動機構帶滑輪或鉸盤的金屬構架計算規則
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