单工制通信就是指通信的双方只能()地进行发信和收信,不能同时进行。
交替
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Shewastooshytospeak____.
Safetyinspection
Bythesametoken,regularlysearchingtheInternetallowsyoutobethefirstinlinetoapply______companiespostnewjobopenings.
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Highbloodpressure