Cov cuab yeej tshuaj xyuas 1. Ua ntej ua haujlwm, tus choj crane yuav tsum tau kuaj xyuas tag nrho, suav nrog tab sis tsis txwv rau cov khoom tseem ceeb xws li cov hlua hlau, hooks, pulley brakes, limiters, thiab cov khoom siv taw qhia kom paub tseeb tias lawv nyob hauv qhov zoo. 2. Xyuas cov crane khiav, lub hauv paus thiab ib puag ncig ...
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