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【单选题】
从教师表中找出的女性讲师的记录,属于( )关系运算。A.
选择
B.
投影
C.
连接
D.
交叉
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【多选题】关于计算机运算速度，下列说法正确的是()
A.
总线频率
B.
CPU主频
C.
运算速度与 CPU主频有关，主频越高， CPU运算速度越快。
D.
每秒钟所执行的加法运算的次数
E.
每秒钟所能执行的指令条数
F.
外频
【简答题】听下面一段对话，回答第1-3小题。 1. Who does the girl want to buy a gift for? [ ] A. Her father. B. Her mother. C. Her brother. 2. How much is the brown wallet? [ ] A. $40. B. $25. C. $13. 3. What does the m...
【单选题】Directions: Each sentence has a word or phrase underlined. There are four words or phrase beneath each sentence. Choose the one word or phrase which would best keep the meaning of the original sentenc...
A.
to force somebody to do something, by law, because it is a duty, etc.
B.
to help sb by doing what they ask or what you know they want
C.
to show your thanks when you got help
D.
to make somebody be willing to do something
【简答题】CPU的主频又称作______，主频越高，计算机的速度就越快。
【简答题】在 Transact-SQL语句中,如果表达式中同时包含逻辑运算符NOT、AND和OR,优先级的顺序是 大于 大于 。
【单选题】Directions: Each sentence has a word or phrase underlined. There are four words or phrase beneath each sentence. Choose the one word or phrase which would best keep the meaning of the original sentenc...
A.
do something illegal or bad
B.
decide to use the money or resources for a particular purpose
C.
do not want to say what you really think about it or what you are going to do
D.
decide that you want to have a long-term relationship with someone
【简答题】The girl is mine. Her name is Gayle. She is 13, as will-full as a filly under halter for the first time. Her hair is dark; her eyes hazel; her body slender and barely beginning to bud. She is still a...
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