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【单选题】
Phosphoric acid is tribasic, with p K a 's of 2.14, 6.86, and 12.4. The ionic form that predominates at pH 3.2 is:A.
H 3 PO 4 .
B.
H 2 PO 4 – .
C.
HPO 4 2– .
D.
PO 4 3– .
E.
None of the answers is correct.
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【单选题】()是阴阳学说的基本内容。
A.
阴长阳消,阴阳互根互用,相互转化,消长平恒
B.
阴阳对立制约,阴阳偏差,阴阳消长平恒,相互转化
C.
阴阳对立制约,相互转化,互根互用,阴长阳消
D.
阴阳互根互用,对立制约,相互转化,消长平恒
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