网络协议主要要素为()。
C
暂无解析
Theman_______thephotoismyfather.
--Shemustbeinred.
No,_____.Shewearsagreencoat.
Thenumberofsecondsinoneday_____Thenumberofminutesinoneweek
About________percentoftheearth'ssurfaceiscoveredwithwater
Lookoutofthewindow.(改为否定句)
______________________________
