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单项选择题
A.news:comp.infosystems.www.misc
B.news://comp.infosystems.www.misc
C.//comp.infosystems.www.misc
D.comp.infosystems.www.misc
单项选择题
A.//gopher.umn.edu
B.gopher://gopher.umn.edu
C.gopher.umn.edu
D.http://gopher.umn.edu
单项选择题
A.mailto:U@sjk.one
B.mailto:/U@sjk.cne
C.mailto://U@sjk.cnc
D.//:lU@sjk.cnc