已知关系模式：学生(学号，姓名，性别，年龄，系别)，用关系代数查询中文系的男学生的学号、姓名、年龄。
Ⅱ学号，姓名年龄(σ系别=‘中文’性别=‘男’(学生))
暂无解析
TheIndo-EuropeanlanguagefamilyismadeupofthelanguagesofthefollowingEXCEPT______.
Unlikehiscontemporariesintheearly20thcentury,()didnotbreakupwiththepoetictraditionnormadeanyexperimentonform.
JeanWagner’mostsenduringcontributiontothestudyofAfro-Americanpoetryishisinsistencethatit________inareligious,aswellasworldly,frameofreference.
Theothertimingsystembelongsinourinternalclocks，which，left________，wouldtiethebodytoa25-hourrhythm.
Alinguistictheoryisconstructedaboutwhat______isandhowitworks.
