1. Tsis txhob sib piv cov ntaub ntawv nrog lwm tus. Yog tias koj sib piv cov ntaub ntawv, nws yog qhov zoo tshaj plaws los yuav tib tus qauv lossis qhia rau kuv tus qauv, Kuv tuaj yeem pom zoo rau tus nqi sib raug zoo viscometer 2. Txog cov khoom siv los ntsuas, koj puas paub qhov kwv yees li viscosity? Yog koj tsis paub, thov muab cov xwm txheej, su...
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