Lus piav qhia luv luv:

Khoom nta: Phau ntawv spur gearbox yog tsuas yog siv rau cov yeeb nkab network li qub, zoo li lub rooj vag valve, lub ntiaj teb valve thiab penstock, nws tuaj yeem ntsia ntawm txhua lub kaum sab xis, tes log loj tuaj yeem tsim raws li tus neeg siv khoom qhov project. Feem ntau qhov piv yog 3, 3.5, 4.8, tuaj yeem kho raws li lub sijhawm ua haujlwm, xav tau cov ntaub ntawv, txais tos hu rau peb.