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【单选题】
关于线性规划模型的可行域,下面 ( ) 的叙述正确
A.
可行域内必有无穷多个点
B.
可行域必有界
C.
可行域内必然包括原点
D.
可行域必是凸 集
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【单选题】Do you shareChris Singer’s almost religious ________ for Bob Dylan?
A.
reverence
B.
reverent
C.
kindness
D.
act
【单选题】一名从未见过飞机的幼儿,看到蓝天上飞过的一架飞机说:“看,一只很大的鸟!”从幼儿语言发展的角度来看,这一现象反映的特点是()
A.
过渡规范化
B.
扩展不足
C.
过度泛化
D.
电报式言语
【简答题】A.MD5和3DES B.MD5和SHA1 C.DES和SHA1 D.DES和3DES
【单选题】Bob Dylan is known for everything below EXCEPT ______.
A.
his particular voice
B.
the quality of his song-writing
C.
the quantity of his record sales
D.
his importance in rock music
【单选题】Bob Dylan is ______.
A.
a rock singer
B.
an English singer
C.
a blues singer
D.
a country singer
【简答题】判断下列事件中,哪些事件发生的可能性是相同的,哪些不是. (1)抛一枚均匀的骰子,出现1点或5点朝上的机会. (2)从装有5个红球,3个白球的袋中任取一球,取到红球或白球的可能性. (3)从一副扑克牌中任取一张,取到小王或黑桃5的可能性. (4)掷两枚骰子,出现的点数和是“2”和“5”的可能性.
【简答题】阅读理解。 Dolan began swimming at the age of 5,because his elder sister Kathleen was a swimmer.' Whatever she did, I wanted to beat her,' he says. While he says he was a' pool rat' as a child, he didn't a...
【多选题】下列属于观叶类花卉的是( )。
A.
花叶芋
B.
紫背竹芋
C.
白网纹草
D.
猪笼草
【单选题】1口袋里有红、白、黑球各若干个,从中随机地摸出一个,是红球; 2在标准大气压下,水在90度沸腾; 3射击运动员射击一次,命中10环; 4同时掷两颗骰子,出现的点数之和不超过12 上述事件中,随机事件是
A.
①④
B.
②③
C.
①③
D.
②④
【多选题】Select the two correctstatements from the list below that describe DES and 3DES: ()
A.
3DES is muchmore secure than DES.
B.
Both DES and 3DES are stream ciphers.
C.
DES uses 64 bitkeys, although the effective key lengthis only 56bits.
D.
The decryption operation for both DES and 3DES is the same as the encryption operation.
E.
DES can only be used for encryption, whereas 3DES can also be used for authentication.
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