与噬菌体有关的基因转移和重组的方式有()

单项选择题有关系表SC ( S# , C#, Score)，求既学过“001”号课又学过 “002”号课的所有学生的学号，下列SQL语句正确的是( )。 A、Select S1.S# From SC S1, SC S2 Where S1.S# = S2.S# and S1.C#=‘001’ and S2.C#=‘002 ; B、Select S# From SC Where C# = ‘001’ AND C#=‘002’; C、Select S2.S# From SC S1, SC S2 Where S1.S# = S2.S# or S1.C#=‘001’ and S2.C#=‘002 ; D、Select S1.S# From SC S1 Where S1. C# = ‘001’ AND S1.C#=‘002’;

单项选择题要找回因为断电来不及保存的文件应该使用播放跟踪 培训文件。 A、正确 B、错误