Tam sim no, hluav taws kub npauj npaim li qub tau siv dav, xws li cov kav dej dav dav thiab cov kav dej tua hluav taws. Feem ntau, xws li hluav taws kub npauj npaim valve yuav tsum muaj qhov zoo ntawm cov qauv yooj yim, txhim khu kev qha sealing, lub teeb qhib thiab yooj yim txij nkawm. Cov hauv qab no yog cov lus qhia luv luv rau lub fir ...
Nyeem ntxiv