1. qhov hluav taws kub qhov hluav taws kub tiv thaiv qib hluav taws kub qhov rooj tau muab faib ua A, B, C peb theem nyob rau hauv Suav teb, uas yog los qhia qhov hluav taws kub qhov rooj hluav taws kev ncaj ncees, uas yog, lub sij hawm hluav taws kub, tus qauv tam sim no nyob rau hauv Suav teb tsis tsawg tshaj li 1.5 teev. ntawm chav kawm A lub sijhawm hluav taws kub, chav kawm B tsis tsawg dua 1.0 teev, cl ...
Nyeem ntxiv