【单选题】A humorous piece of writing can make the reader's emotional responses untrustworthy because ______.
A.
it expresses the truth of the sadness of human life with a sparkling suce
B.
everyone has his happy moments and unhappy moments
C.
there is an obvious line between laughing and crying
D.
it is like poetry, very rhythmic
【简答题】根据某些条件对一个关系作水平分解,选择符合条件的元组组成一个新的关系,这样的操作称为( )。 A)投影 B)选择 C)等值连接 D)自然连接
【简答题】根据某些条件对一个关系作水平分解,选择符合条件的元组组成一个新的关系,这样的操作称为( )。 A)投影 B)选择 C)等值连接 D)自然连接
【简答题】The author claims that the best way a reader can show admiration for a piece of poetry or prose is ________. A) to be able to appreciate it and memorize it B) to yze its essential features C) to t...
【单选题】根据某些条件对一个关系作水平分解,选择符合条件的元组组成一个新的关系,这样的操作系称为