日本三级无码啪啪区|午夜视频久久一区久久一|AAAAA一级黄片|日本久久99久久|国际精品AV在线|狠狠2015亚洲一区|美腿丝袜亚洲网站|欧美色多多人人看|国产超碰美女在线|www色色在线色

單詞乎

pulley block

pulley block是什么意思、pulley block怎么讀

pulley block漢語翻譯

滑輪組
【化】 滑輪組

pulley block英語解釋

名詞 pulley block:

  1. a simple machine consisting of a wheel with a groove in which a rope can run to change the direction or point of application of a force applied to the rope
    同義詞：pulley, pulley-block, block
0
糾錯