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【单选题】
在编写C#,若需要一个数组中的所有元素进行处理,则使用()循环体最好.A.
for循环
B.
do循环
C.
while循环
D.
foreach循环
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举一反三
【单选题】The current ______steady and strong, for the boat kept moving forward smoothly.
A.
can't have been
B.
needn't have been
C.
must have been
D.
should have been
【单选题】一个关系模式 R∈ 3NF 是指关系模式中 ( ) 。
A.
R∈1NF，且不 存在多值依赖
B.
R中 不存在部分依赖
C.
R∈1NF，且 不存在传递依赖
D.
R中只有一个候选码
【简答题】根据句意及首字母补全单词，使句意完整。 1. Why didn't you come to my birthday party? Because I had a music l________. 2. This pair of shoes is too big. Do you h ave a________ pair? 3. There is going to be a piano c_____...
【单选题】All of us are looking forward to _____ a trip to the Ming T ombs.
A.
make
B.
making
C.
to making
D.
have made
【简答题】将2NF的关系模式转变为3NF的关系模式，是消除了______。
【单选题】—I don't like the plan they put forward. You have never______ it, haven't you? —______, I seriously doubt its future. [ ]
A.
approved of; No
B.
agree with; Yes
C.
judged; No
D.
supported; Yes
【单选题】The students are looking forward to a good result in the final examination, aren’t they?
A.
getting
B.
have
C.
has
D.
get
【单选题】关系模式3NF是指
A.
满足2NF且不存在非主属性对关键字的传递依赖现象
B.
满足2NF且不存在非主属性对关键字的部分依赖现象
C.
满足2NF且不存在非主属性
D.
满足2NF且不存在组合属性
【单选题】关系模式中3NF是指
A.
满足2NF且不存在非主属性对关键字的传递依赖现象
B.
满足2NF且不存在非主属性对关键字部分依赖现象
C.
满足2NF且不存在非主属性
D.
满足2NF且不存在组合属性
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