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【单选题】
下列各酸中为一元酸的是( )。
A.
H 3 PO 4 ;
B.
H 3 PO 3 ;
C.
H 3 PO 2 ;
D.
H 4 P 2 O 7 。
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A.
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B.
女性化
C.
男性化
D.
神秘
E.
忧郁
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A.
agréable
B.
très
C.
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D.
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A.
冈上肌
B.
冈下肌
C.
大圆肌
D.
肩胛下肌
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A.
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B.
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C.
高贵
D.
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