Tam sim no, kev kho kom zoo nkauj hauv tsev feem ntau yog PPR raj,
Piv nrog galvanized yeeb nkab thiab aluminium-yas yeeb nkab,
Nrog ib puag ncig kev noj qab haus huv, kub tsis kam, siab tsis kam,
Lub neej ua haujlwm ntev, kev teeb tsa yooj yim, tus nqi qis thiab lwm yam zoo.
Yuav muaj cov cim qhia ntawm cov kav dej, xws li "20 * 2.8, 25 * 4.2",
Thawj 20, 25 yog sab nraud ntawm cov yeeb nkab,
Tom qab ntawd 2.8 thiab 4.2 xa mus rau phab ntsa tuab ntawm cov kav dej.
Feem ntau, cov phab ntsa tuab dua, cov yeeb nkab ntev dua.
Xaiv cov yeeb nkab twg, xav pom sab nraud ntawm cov yeeb nkab uas nkag mus rau hauv tsev los txiav txim siab.
Tsev neeg 4 ceg, tsuas yog 4 ceg tuaj yeem siv tau.
Cov yeeb nkab hauv tsev yog 6 yeeb nkab, 6 yeeb nkab, 4 yeeb nkab tuaj yeem siv tau.