1.Efficient thiab ceev: ceev: 25 feeb kom ua tiav ib puag ncig ntawm kev sim; 2.Multiple yam test: 3 chambers tuaj yeem sim sim ntau pawg ntawm cov qauv ntawm nws tus kheej kom ua tiav ntau lub hom phiaj kev xeem; 3.Cov kev pab cuam yooj yim: simultaneous comparative test of