Txoj kev cov menyuam yog ib qho kev pab zoo rau txoj kev compaction. Qhov no yog paub rau cov neeg feem coob. Peb txhua tus tau pom thaum lub sij hawm tsim kho, tshwj xeeb tshaj yog kev tsim kho. Muaj kev caij tsheb kauj vab, tuav, kev vibrations, hydraulics, thiab lwm yam., nrog rau ntau yam qauv thiab specifications, koj tuaj yeem xaiv raws li koj xav tau. Cov...
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