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【简答题】
已知如下关系:学生Student(S#, Sname),课程Course(C#, Cname),选课SC(S#, C#, Score),其中S#为学号,Sname为学生姓名,C#为课号,Cname为课程名,Score为成绩。下列Select语句中,可以实现“查询既'001'号课程,又'002'号课程的学生的学号”的是 。 A. Select  S#  From  SC Where  C# =‘001’  AND  C#=‘002’; B. Select    SC1.S#   From  SC   SC1, SC  SC2 Where   SC1.S# = SC2.S#  and  SC1.C#=‘001’  and  SC2.C#=‘002'; C. Select    S#   From  SC Where   C#=‘001’   and  S#   in  ( Select  S#  From  SC  Where  C# =‘002’) ; D. Select    S#   From  SC Where   C#=‘002’   and  S#   in  ( Select  S#  From  SC  Where  C# =‘001’) ;
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【单选题】We can never forget the days _______the two astronauts in spaceship worked together and the days _______we spent together.
A.
which; when
B.
when; which
C.
what; that
D.
on which; when
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on which;when
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which;when
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what;that
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when;which
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