Nws lub luag haujlwm tseem ceeb yog shovel xoob cov ntaub ntawv thiab kev ua haujlwm luv luv. Nws yog ib qho ntawm kev loj hlob sai tshaj plaws, ntau lawm thiab muag khoom, thiab kev lag luam xav tau qauv hauv kev tsim kho tshuab. Peb feem ntau pom lub log loaders feem ntau, thiab qhov opposite yog cov crawler loaders. Piv nrog rau hom crawler, nws muaj qhov zoo ntawm kev ua haujlwm zoo, tsis muaj kev puas tsuaj rau txoj kev nto, thiab kev ua haujlwm yooj yim. Yog li ntawd, log loaders yog dav siv. Loader yog ib yam ntawm lub ntiaj teb shovel tsheb thauj mus los machinery dav siv nyob rau hauv txoj kev, railways, ports, docks, thee, mining, water conservancy, teb chaws tiv thaiv thiab lwm yam dej num thiab kev tsim kho hauv nroog. Nws ua lub luag haujlwm tseem ceeb hauv kev txo qis kev siv zog, ua kom lub zog ua haujlwm sai, thiab txhim kho qhov project zoo.
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