设有关系R（A，B，C）和S（D，E，A），其中A是R的主键和S的外键_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题问答题简答题

设有关系R（A，B，C）和S（D，E，A），其中A是R的主键和S的外键，为了不破坏参照完整性，当修改R中的A值时，对S中的A值可能有几种修改？

答案

参考答案：

NOACTION：对依赖表没影响，

CASCADE：对应外键值一起修改，

RESTRICT：只有当依赖表中没有对应的外键值时才能修改，否则拒绝修改，

SETNULL：对应外键值全置空，

SETDEFAULT：对应外键值全置为预设的默认值。

完形填空

阅读下面短文，掌握其大意，从每题所给的A、B、C、D四个选项中，选出最佳选项，并在答题卡上将该项涂黑。
Beware of those who use the truth to cheat. When someone tells you something that is  36   , but leaves out important information that should be     37  , he can create a false impression.
For example, someone might say, “I just    38    a hundred dollars on the lottery. It was great. I took that dollar ticket back to the store and     39   it for one hundred dollars!”
This guy’s a winner,    40  ? Maybe, maybe not. We then discover that he bought two hundred     41    , and only one was a winner. He’s really a big     42   !
He didn’t say anything that was    43   , but he deliberately left out some important  44  . That’s called a half-truth. Half-truths are not technically     45  , but they are just as not   46    .
Untrustworthy candidates in     47    campaigns often use this strategy. Let’s say that during Governor Smith’s last term, her state lost one million jobs and   48   three million jobs. Then she    49    another term. One of her opponents runs an advertisement   50  , “During Governor Smith’s term, the state lost one million jobs!” That’s true.    51   , an honest statement would have been, “During Governor Smith’s term, the state had a net gain of   52   million jobs.”
Advertisers will sometimes use half-truths. It’s    53   the law to make false claims so they try to mislead you with the    54   . An advertisement might boast (吹嘘), “Nine out of ten doctors recommend Yucky Pills to cure nose pimples.” It     55   to mention that they only asked ten doctors and nine of them work for the Yucky Corporation.
This kind of cheat happens too often. It’s a sad fact of life: Lies are lies, and sometimes the truth can lie as well.

C．interesting

B．information

单项选择题

根据我国《继承法》的规定，放弃继承与放弃受遗赠可采取的行为方式是( )。

A．放弃继承既可采用明示方式，也可采用默示方式，放弃受遗赠亦如此

B．放弃继承只能采用明示方式，放弃受遗赠亦如此

C．放弃继承只能采用明示方式，放弃受遗赠则既可采用明示方式，也可采用默示方式

D．放弃继承既可采用明示方式，也可采用默示方式，放弃受遗赠只能采用明示方式