题目
()is the Internet commerce designed for direct communications and commercial relationship between a firmand its end customer.
A.B2C
B.B2B
C.B2A
D.A2B
第2题
A.select * from emp where comm=‘‘;
B.select * from emp where comm=null;
C.select * from emp where nvl(comm)=0;
D.select * from emp where comm is null;
E.select * from emp where nvl(comm,0)=0;
第7题
A.A.profoundly
B.B.deeply
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