• 2022-06-09 问题

    Slaverywas______intheU.S.inthe19thcentury. A: retailed B: canceled C: abolished D: stroked

    Slaverywas______intheU.S.inthe19thcentury. A: retailed B: canceled C: abolished D: stroked

  • 2021-04-14 问题

    中国大学MOOC:"The pair(s) of English phonemes____ differ inthe place of articulation.";

    中国大学MOOC:"The pair(s) of English phonemes____ differ inthe place of articulation.";

  • 2022-05-29 问题

    Back inthe Charlestown Prison, Malcolm X was very ___________ with Bimbi’s stock ofknowledge

    Back inthe Charlestown Prison, Malcolm X was very ___________ with Bimbi’s stock ofknowledge

  • 2022-06-07 问题

    The pair(s) of English phonemes____ differ inthe place of articulation. A: /ʃ/ and /ʒ/ B: /θ/ and /ð/ C: /t/ and /k/ D: /m/ and /n/

    The pair(s) of English phonemes____ differ inthe place of articulation. A: /ʃ/ and /ʒ/ B: /θ/ and /ð/ C: /t/ and /k/ D: /m/ and /n/

  • 2022-06-01 问题

    2Wheredidtheaccidenthappen?Inthe _____________

    2Wheredidtheaccidenthappen?Inthe _____________

  • 2022-05-30 问题

    What is the purpose of the “dragons” by asking questions inThe Dragon’s Den. A: To attract attention B: To see would-be entrepreneur’s potentials C: To get support D: To have heated debate

    What is the purpose of the “dragons” by asking questions inThe Dragon’s Den. A: To attract attention B: To see would-be entrepreneur’s potentials C: To get support D: To have heated debate

  • 2022-05-27 问题

    在“学生-选课-课程”数据库中的3个关系如下:S(SNO, SNAME, SEX, AGE); C(CNO, CNAME, TEACHER);SC(SNO, CNO, GRADE),查询年龄大于19岁的女学生的学号。若用关系代数表达式来表示为( )。 A: ПSNO (σSEX=’女'(S) -σAGE<=19(S) ) B: ПSNO (σSEX=’女'(S) ∩ σAGE>19(S) ) C: ПSNO (σSEX='女'∧ AGE>19(S)) D: ПSNO (σSEX=’女’(S) ∪ σAGE>19(S) )

    在“学生-选课-课程”数据库中的3个关系如下:S(SNO, SNAME, SEX, AGE); C(CNO, CNAME, TEACHER);SC(SNO, CNO, GRADE),查询年龄大于19岁的女学生的学号。若用关系代数表达式来表示为( )。 A: ПSNO (σSEX=’女'(S) -σAGE<=19(S) ) B: ПSNO (σSEX=’女'(S) ∩ σAGE>19(S) ) C: ПSNO (σSEX='女'∧ AGE>19(S)) D: ПSNO (σSEX=’女’(S) ∪ σAGE>19(S) )

  • 2022-05-27 问题

    在“学生-选课-课程”数据库中的3个关系如下:S(SNO, SNAME, SEX, AGE); C(CNO, CNAME, TEACHER);SC(SNO, CNO, GRADE),查询年龄大于19岁的女学生的学号。若用关系代数表达式来表示为( )。 A: ПSNO (σSEX=’女'(S) -σAGE<=19(S) ) B: ПSNO (σSEX='女'∧ AGE>19(S)) C: ПSNO (σSEX=’女'(S) ∩ σAGE>19(S) ) D: ПSNO (σSEX=’女’(S) ∪ σAGE>19(S) )

    在“学生-选课-课程”数据库中的3个关系如下:S(SNO, SNAME, SEX, AGE); C(CNO, CNAME, TEACHER);SC(SNO, CNO, GRADE),查询年龄大于19岁的女学生的学号。若用关系代数表达式来表示为( )。 A: ПSNO (σSEX=’女'(S) -σAGE<=19(S) ) B: ПSNO (σSEX='女'∧ AGE>19(S)) C: ПSNO (σSEX=’女'(S) ∩ σAGE>19(S) ) D: ПSNO (σSEX=’女’(S) ∪ σAGE>19(S) )

  • 2022-05-29 问题

    ShanghaiDisneylandPark is the sixthDisneylandPark inthe world and the firstinmainlandChina

    ShanghaiDisneylandPark is the sixthDisneylandPark inthe world and the firstinmainlandChina

  • 2022-06-06 问题

    Inthe last decade,_______________(电脑技术发展迅速).

    Inthe last decade,_______________(电脑技术发展迅速).

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