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【单选题】
命题p:“x-1=0且x+2=0”的否定形式是( )A.
x-1≠0且x+2≠0
B.
x-1=0且x+2≠0
C.
x-1=0或x+2≠0
D.
x-1≠0或x+2≠0
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皮皮学刷刷变学霸
举一反三
【单选题】What are the ideal conditions for creating clouds?
A.
The temperature is as low as minus 235 degrees Fahrenheit.
B.
The air is a million times drier than that of Sahara.
C.
Extremely dry air and low enough temperature.
D.
A mild climate and the build-up of carbon dioxide.
【单选题】She _____ what had happened in a low voice for fear ________ she said might be overheard by others [ ]
A.
told; what
B.
whispered to me ; that what
C.
said to me ; what
D.
told me; that what
【单选题】属于遗传性溶血性贫血的是
A.
阵发性睡眠性血红蛋白尿症
B.
自身免疫性溶血性贫血
C.
AB0血型不合溶血性贫血
D.
G-6-PD缺陷症
E.
微血管病性溶血性贫血
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