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Cov tsom iav hlau ua li cas?
tsom iav tsim Tag nrho cov iav tsom iav yuav tsum tau tsim ua ntej mus rau hauv ntau lawm. Cov iav tsis yog ntau yam khoom lag luam. Qhov tseeb, lawv zoo ib yam li cov khoom siv tes ua tus kheej thiab tom qab tsim khoom loj. Txij li thaum kuv tseem yog menyuam yaus, kuv xav tias homogeneity ntawm iav tsis yog li ntawd ...Nyeem ntxiv -
Puas yog acetate thav duab zoo dua li cov thav ntawv yas?
Cellulose acetate yog dab tsi? Cellulose acetate yog hais txog cov thermoplastic cob tau los ntawm esterification nrog acetic acid ua cov kuab tshuaj thiab acetic anhydride ua tus neeg sawv cev acetylating nyob rau hauv qhov kev txiav txim ntawm catalyst. organic acid esters. Tus kws tshawb fawb Paul Schützenberge thawj zaug tsim cov fiber ntau hauv xyoo 1865, ...Nyeem ntxiv -
Vim li cas koj hais kom hnav looj tsom iav dub thaum koj tawm mus?
Hnav looj tsom iav dub thaum mus ncig, tsis yog rau qhov pom xwb, tab sis kuj rau qhov muag kev noj qab haus huv. Hnub no peb yuav tham txog looj tsom iav dub. 01 Tiv thaiv koj ob lub qhov muag ntawm lub hnub Nws yog ib hnub zoo rau kev mus ncig, tab sis koj tsis tuaj yeem qhib koj lub qhov muag rau lub hnub. Los ntawm kev xaiv ib nkawm looj tsom iav dub, koj tuaj yeem n...Nyeem ntxiv -
Qhov zoo ntawm kev hnav tsom iav.
1.Kev hnav tsom iav tuaj yeem kho koj qhov pom kev Myopia yog tshwm sim los ntawm qhov tseeb tias lub teeb nyob deb tsis tuaj yeem tsom mus rau retina, ua rau cov khoom nyob deb tsis meej. Txawm li cas los xij, los ntawm kev hnav lub lens myopic, cov duab meej ntawm cov khoom tuaj yeem tau txais, yog li kho qhov pom. 2. Hnav tsom iav tuaj yeem ...Nyeem ntxiv -
looj tsom iav qhov muag pom kev
Cov looj tsom iav dub yog ib hom khoom muag saib xyuas kev noj qab haus huv rau kev tiv thaiv lub zog stimulation ntawm tshav ntuj los ntawm kev ua phem rau tib neeg lub qhov muag. Nrog rau kev txhim kho ntawm tib neeg cov khoom siv thiab kev coj noj coj ua, looj tsom iav dub kuj tuaj yeem siv los ua kev zoo nkauj lossis cuam tshuam cov hniav nyiaj hniav kub tshwj xeeb ntawm tus kheej style. Sungla...Nyeem ntxiv