Cov ntawv pov thawj zoo

Quantitative analysis of filter paper nyob rau hauv kev tsim cov txheej txheem, daim phom los ntawm hydrochloric acid thiab hydrofluoric acid kho, thiab ntxuav los ntawm dej distilled, thiab feem ntau impurities nyob rau hauv lub fiber, yog li qhov seem tshauv yog heev me ntsis, cov ntsiab ntawm qhov ntsuam muaj me ntsis nyhuv, tsim rau kev txiav txim siab ntau qhov kev ntsuam xyuas. Tam sim no, qhov ntsuam xyuas ntawm kev tsim cov ntawv pov thawj, cov ntawv ceev, nruab nrab qeeb, qeeb peb hom, nyob rau hauv lub tais lim dej nrog ib lub hnab dawb (ceev), xiav daim ntaub (ceev), kab xev liab (qeeb) rau logo classification. Cov duab ntawm daim ntawv lim muaj lub voj voog thiab ob lub voj voog, raws li txoj kab uas hla lub d9cm, DLLCM, d12.5cm, d15cm thiab d18cm tus naj npawb. Square Quantitative lim ntawv muaj 60cmx60cm thiab 30cmx30cm.