Trapezoid thoob
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Trapezoidal thoob
Lub thoob Trapezoidal, tseem hu ua V-ditch thoob lossis V thoob, yog lub npe los ntawm tus qauv tsim uas muaj cov duab trapezoidal.Daim Ntawv Thov Loj: Nws yog rau 1 txog 50 tons nyob rau hauv feem ntau cov xwm txheej, tab sis peb tuaj yeem ua kom nws loj dua kom haum rau cov neeg siv khoom xav tau.Yam ntxwv: a.Ob hom hniav (ib zaug lossis ob) hom thiab cov hniav tuaj yeem ua rau cov kev xav tau sib txawv.b.Qhov tshwj xeeb zoo li, nws qhov dav dav dav ntev dua li qhov dav dav, tso cai rau lub trench lossis channel kom tsis tsim nyog loj thiab ncaj ncaj ...
