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【单选题】
有关基因工程的叙述正确的是（）A.
限制性内切酶只在获取目的基因时采用
B.
重组质粒的形成在细胞内完成
C.
质粒都可以作为载体
D.
蛋白质的结构可为合成目的基因提供资料
E.
以上都不对
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【单选题】Dennis gave up smoking two years ago.But he_____40 cigarettes a day.
A.
has smoked
B.
likes to smoke
C.
used to smoke
D.
was to smoke
【简答题】建立索引的目的是( )。 A降低SQL Server数据检索的速度 B与SQL Server数据检索的速度无关 C加快数据库的打开速度 D提高SQL Server数据检索的速度
【简答题】Conversation T w o 6. A. the United States B. The United Kingdom C. 14 developing countries D. 40 developing countries 7. A. Half the man and 11 percent of the women. B. 60% of the man and 22 percent...
【多选题】SQL Server提供了如下哪些创建索引的方法?(多选)
A.
利用SQL Server管理平台创建索引
B.
利用Transact-SQL语句中的CREATE INDEX命令创建索引
C.
创建表的PRIMARY KEY约束时自动创建索引。
D.
创建表的UNIQUE约束时自动创建索引。
【简答题】在SQL Server 2000中可创建3种类型的索引，即惟一性索引、( )和聚集索引。
【简答题】在哪些情况下SQL Server会自动建立索引?
【单选题】Suppose that Charles wants to dine at a fancy restaurant,but the only available table is in the smoking section. Charles dislikes thesmell of cigarette smoke. He notices that only one person, Sam, is ...
A.
Sam continues to smoke because he has a right to smoke in the smoking section.
B.
Charles offers Sam between $15 and $40 not to smoke. Sam accepts, and both parties are better off.
C.
Charles offers Sam between $15 and $40 not to smoke. Sam declines because he has a right
D.
Only a government policy banning smoking in restaurants will solve this problem.
【简答题】2 You should spend about 40 minutes on this task. Write about the following topic: Smoking not only harms the smoker, but also those who are nearby. Therefore, smoking should be banned in public place...
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