chain pulley block
... 滑轮组吊车 pulley block hoist 链滑轮组 chain pulley block 舱口滑轮组 hatch whip ...
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将钢骨柱固定在专用胎架上，通过倒链滑移至安装点下方后，采用滑轮组和卷扬机进行提升就位。
Steel column is fixed to special jig, slipping below the installation position by chain block and lifting by pulley block and windlass.
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