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【单选题】
下列溶液中一定呈中性的是 [ ]A.
pH=7的溶液
B.
的溶液
C.
的溶液
D.
加入酚酞试液呈无色的溶液
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皮皮学刷刷变学霸
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【简答题】Humans have sewn by hand for thousands of years. It was said that the first thread was made from animal muscle and sinew (肌腱). And the earliest needles were made from bones. Since those early days, ma...
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A.
commit
B.
to commit
C.
to have committed
D.
committing
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【简答题】Humans have sewn by hand for thousands of years. It was said that the first thread was made from animal muscle and sinew (腱). And the earliest needles were made from bones. Since those early days, man...
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