①Cov ntaub ntawv-yas cov khoom sib xyaw. Daim ntawv muaj kev luam ntawv zoo, zoo huab cua permeability, dej tsis zoo, thiab deformation ntawm kev sib cuag nrog dej; yas zaj duab xis muaj dej tsis kam thiab huab cua nruj, tab sis tsis zoo luam ntawv. Tom qab ob qhov sib xyaw ua ke, com ...
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