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【单选题】
室温下,饱和 H 2 S 水溶液中 [S 2- ] 为: ( ) (已知 K a1 =1.1 × 10 -7 , K a2 =1.0 × 10 -14 )A.
1.1× 10 -7
B.
1.0× 10 -14
C.
1.1× 10 -21
D.
2.0× 10 -9
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【单选题】By the 1980s, according to international but admittedly inconsistent definitions of literacy, about seven out of ten adults in the world were considered literate. The increase in literacy from ancient...
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B.
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C.
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【单选题】--- Let’s go shopping online, _________?
A.
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shall we
D.
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【单选题】By the 1980s, according to international but admittedly inconsistent definitions of literacy, about seven out of ten adults in the world were considered literate. The increase in literacy from ancient...
A.
It is fairly easy to determine literacy
B.
There is no illiteracy in a rich country
C.
History sees an even progress towards literacy
D.
In history literacy suffers ups and downs
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