Nyob rau hauv Suav teb, Xiazhi yog 10th hnub ci lub sij hawm ntawm cov tsoos suav daim ntawv qhia hnub.Nyob rau lub caij ntuj sov, qhov nruab nrab cov av noo hnyav li ntawm 30-45 feem pua.Kev tswj cov av noo yog qhov tseem ceeb rau kev tsim khoom lag luam, tshwj xeeb tshaj yog nyob rau thaj tsam ntawm semiconducor, hnub ci, vaj huam sib luag, tsev muag tshuaj, LED thiab ....
Nyeem ntxiv