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【单选题】
关于码的正确描述是A.
关系中每个单独属性均可作为码
B.
关系中作为码的属性，该属性在各个元组上的值均不相同
C.
任意属性的组合均可作为码
D.
由属性组合构成的码，其中至少有一个外码
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反馈参考答案：
举一反三
【简答题】某企业采购员李某某到外地采购材料,委托开户银行将¥100,000汇往,外地开立采购专户。根据收到银行汇款的回单,编制的会计分录为
【简答题】What service will help you to save more time? ____________________
【简答题】请写出如下代码执行的结果。 $a
= 'hello'; $hello
= 'PHP'; $PHP
= 'best'; echo $$$a;
【单选题】____________, the less time you have to see them.
A.
The more people you know
B.
More you know people
C.
The more you know people
D.
More people you know
【简答题】请写出如下代码执行的结果。 $a = 'hello'; $hello = 'PHP'; $PHP = 'best'; echo $a; echo $$a; echo $$$a;
【单选题】The more time you spend on the Internet．the less time you are with your family and friends．
A.
Right．
B.
Wrong．
C.
Doesn’t Say．
【简答题】The more you put your time and effort into the project,___________________________________________________________ (你越可能成功).
【单选题】. ---You must have had a good time at the party last night, didn’t you ? ---________. Actually, it was a bit boring.
A.
Oh, great
B.
Not really
C.
I suppose so.
D.
That’s OK
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