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Cov kev daws teeb meem zoo tshaj plaws rau pej xeem kev nyab xeeb kev sib txuas lus thaum muaj xwm txheej ceev
Hauv kev nyab xeeb ntawm pej xeem, kev sib txuas lus thaum muaj xwm txheej ceev yog qhov tseem ceeb rau kev tswj xyuas kev sib txuas lus thaum muaj teeb meem. Cov tshuab no sib xyaw ua ke ntau yam thev naus laus zis xws li lub platform thaum muaj xwm txheej ceev, satellite kev sib txuas lus tshuab, shortwave thiab ultrashortwave systems, thiab tej thaj chaw deb saib xyuas ...Nyeem ntxiv
