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【单选题】
乙醇 与乙酸反应时,以下 可起催化作用 的是( )。
A.
氯化氢气体
B.
硫酸
C.
磷酸
D.
以上都对
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【单选题】下列关于数据库表的叙述中,错误的是( )
A.
一个数据库表只能属于一个数据库
B.
一个数据库表可以属于多个数据库
C.
数据库表可以移出数据库成为自由表
D.
自由表可以添加到数据库中成为数据库表
【单选题】The last sentence in the first paragraph, 'Mayoral knew no one who had been close to a healthy gray whale and lived' means ______.
A.
nobody had ever approached a living whale
B.
among his friends no one saw any whale that was still alive
C.
no one he knew had ever touched a living whale
D.
whales would cat up anyone they catch without exception
【单选题】下列关于数据库表的叙述中,错误的是
A.
一个数据库表只能属于一个数据库
B.
一个数据库表可能属于多个数据库
C.
数据库表可以移出数据库成为自由表
D.
自由表可以添加到数据库成为数据库表
【单选题】下列关于数据库表的叙述中,错误的是()
A.
自由表可以添加到数据库中称为数据库表
B.
一个数据库表只属于一个数据库
C.
数据库表可以移出数据库称为自由表
D.
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【单选题】The ______ occurs in the first eight weeks of pregnancy, though no one understands cause of the disease.
A.
version
B.
anxiety
C.
homesickness
D.
defect
【单选题】The last sentence in the first paragraph, 'Mayoral knew no one who had been close to a healthy gray whale and lived' means ______.
A.
nobody had ever approached a living whale
B.
among his friends no one saw any whale that was still alive
C.
no one he knew had ever touched a living whale
D.
whales would eat up anyone they catch without exception
【单选题】In the first ,no one got two-thirds of the vote. So the voting continued.
A.
ball
B.
ballet
C.
ballot
D.
bald
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