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【判断题】
哲学带偶乌托邦性质。()
A.
正确
B.
错误
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举一反三
【单选题】Trees that grow faster are developed by ______.
A.
planting many trees and fertilizing them
B.
collecting seeds from strong, slow growing trees
C.
selecting the seeds of the fastest growing trees
D.
feeding them high-energy plant foods
【单选题】根据SQL标准,删除一个表,应该使用下面哪个语句?()
A.
DELETE TABLE
B.
DROP TABLE
C.
DELETE VIEW
D.
DROP DATABASE
【单选题】关于Delete语句,下列说法错误的是(   )
A.
Delete语句不能删除单个列的值,只能删除整行数据
B.
要删除单个列的值,可以使用Update语句,将其更新为Null
C.
Delete语句只能删除表中的数据
D.
Delete语句也能删除表本身
【单选题】关于DELETE语句的说法错误的是( )。
A.
DELETE语句可以删除多行数据
B.
DELETE语句可以删除表中所有数据
C.
DELETE语句可以带有子查询
D.
DELETE语句可以同时删除多个表中的数据
【单选题】要查看stats包中的数据集trees的命令是 trees
A.
trees
B.
look( trees)
C.
print( trees)
D.
type(trees)
【简答题】A.tree-lined B.trees-lining C.trees-lines D.tree-lining
【单选题】If you plant two apple trees in one square yard of land, and the trees' productivity ______ decline.
A.
is bound to
B.
is determined to
C.
is unlikely to
D.
is related to
【单选题】— What will the land be used for? — _____. [     ]
A.
To plant young trees
B.
Young trees will be planted
C.
They will plant young trees
D.
Planting young trees
【单选题】What is the passage mainly concerned withy
A.
The benefits of trees.
B.
Trees and soil protection.
C.
The various uses of trees.
D.
Different attitudes toward trees.
【单选题】关于Delete语句,下面说法正确的是哪个?( )
A.
使用Delete语句删除时不能没有Where条件。
B.
使用Delete语句删除时可以不提供需要删除数据的表名。
C.
使用Delete语句删除时如果有Where条件,只有满足条件的记录被删除。
D.
使用Delete语句删除时,将删除全部记录。
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