A.通過電話、郵件等方式提出善意的改進(jìn)建議B.立即在頻率上當(dāng)面加以指出和糾正C.立即報告無線電管理機構(gòu)進(jìn)行干涉D.立即報告當(dāng)?shù)貥I(yè)余無線電協(xié)會,由其總部電臺到頻率上進(jìn)行糾察
A.Calling you,Roger?B.Is the frequency in use?C.Is any body in the frequency?D.Any body here?
A.2fT–fR或(fT+fR)/2 B.fT–fR或fT+fR C.2(fT–fR)或2(fT+fR) D.2fT或2fR