Fingertip pulse oximeter tau tsim los ntawm Millikan hauv xyoo 1940 los saib xyuas cov pa oxygen hauv cov hlab ntsha, qhov taw qhia tseem ceeb ntawm qhov hnyav ntawm COVID-19. Yonker tam sim no piav qhia yuav ua li cas ...
Lub neej yog ntau tshaj qhov hustle thiab bustle Muaj cov paj huam thiab nyob deb teb Ntau cov yeeb yuj lub tuam txhab pab pawg yog li thiaj li yuav ntxiv dag zog rau pab pawg, txhim khu kev nco qab, sib sib zog nqus t ...