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【单选题】
双指示剂法测定混合碱试液中各组分含量，若组分为NaHCO3，则下列关系正确的是？A.
V 2 ＞ V 1 ，且均不等于0；
B.
V 1 ＞ V 2 ，且均不等于0；
C.
V 2 = V 1 ，且均不等于0；
D.
V 2 ＞0， V 1 =0
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【多选题】下列关于时间价值系数的关系式,表达正确的有:
A.
(F/A，i，n)=(F/P，i，n)×(P/A，i，n)
B.
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C.
(P/F，i，n)=(P/F，i，n1)+(P/F，i，n2)，其中：n1+n2=n
D.
(P/A，i，n)=(P/F，i，n)/(A/F，i，n)
E.
1/(F/A，i，n)=(F/A，i，1/n)
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