Cov lus qhia luv luv rau lub kiv cua

Seem-kiv cua yog tus kiv cua tshwj xeeb tsim rau cov pa hluav taws xob sib tsoo yog muab cov khoom txias tshaj plaws ntawm cov khoom lag luam txias Lub tshuab hluav taws xob siab ncaj qha cov kab ke, txhawm rau kom tau raws li cov neeg sib khi ntawm cov pob zeb thee}} Centrifugal kiv cua yog siv rau sealing kiv cua {}}