Dab tsi li qub tsim nyog rau kev lag luam tshuaj lom neeg?
Dab tsi li qub tsim nyog rau kev lag luam tshuaj lom neeg? Valve, tus tswj ib feem ntawm cov kua conveying system, muaj lub zog ntawm kev txiav tawm, tswj, coj, tiv thaiv countercurrent, stabilizing siab, shunt los yog overflow siab nyem. Nws varieti...
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