Txais cov cuab yeej siv qib siab ntawm cov lej tswj kev ua haujlwm thiab kev tsim khoom, Khaws nrog cov thev naus laus zis siab thiab txhim kho tsis tu ncua.
Cov khoom siv raw khoom zoo, qib siab ntawm cov khoom siv thiab cov khoom siv ntsuas kom ntseeg tau cov khoom zoo. Tus qauv qauv loj, yooj yim rau nruab.
XINFA cov ntaub ntawv tshiab suav nrog paj av, carbon molecular sieves, nitrogen manufacturing, thiab lwm yam.
Peb muaj qee qhov tseeb ntawm no
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Cov neeg ua haujlwm hauv tuam txhab
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