_____efforts are needed in order to finish important unpleasant tasks.()
A. Consecutive
B. Condensed
C. Perpetual
D. Persistent
查看答案
It is said that "Viagra”()() magical powers that can cure impotence.
A. has
B. exaggerates
C. develops
D. yields
It is said that "Viagra”()() magical powers that can cure impotence. A
A. has
B. exaggerates
C. develops
D. yields
要删除mytable表中的myindex索引，可以使用（ ）语句。
A. Delete INDEX mytable.myindex
B. Delete mytable.myindex
C. DROP myindex
DROP INDEX mytable.myindex
关于索引的作用,最完整的说法是( )
A. 便于管理
B. 提高查询速度
C. 节省存储空间
D. 提高查询和更新速度
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