1.Normal nplooj caij nplooj ntoos hlav: Nws yog ib yam nyob rau hauv hnyav-lub luag hauj lwm tsheb, uas yog tsim los ntawm ntau daim ntawm reeds ntawm txawv lengths thiab uniform dav, feem ntau ntau tshaj 5 daim.Qhov ntev ntawm lub reed yog successively ntev ntawm hauv qab mus rau sab saum toj, thiab hauv qab reed yog luv tshaj, yog li f ...
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