Taw qhia Valve lub kaus mom me me tab sis qhov tseem ceeb ntawm lub tsheb lub log valve stems. Lawv ua raws li kev tiv thaiv npog, tiv thaiv plua plav, av, thiab noo noo los ntawm kev nkag mus rau lub valve thiab ua rau kev puas tsuaj. Txawm hais tias lawv yuav zoo li tsis tseem ceeb, ...
Nyeem ntxiv