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[单选题]
将0.4 mol/L NaH2PO4溶液和0.2 mol/LNaOH溶液等体积混合配制成缓冲溶液,其抗酸成分和抗碱成分分别是
A.NaH2PO4和Na2HPO4
B.Na2HPO4和Na3PO4
C.Na2HPO4和NaH2PO4
D.NaH2PO4和Na3PO4
![](https://lstatic.shangxueba.com/sxbzda/h5/images/tips_org.png)
A.NaH2PO4和Na2HPO4
B.Na2HPO4和Na3PO4
C.Na2HPO4和NaH2PO4
D.NaH2PO4和Na3PO4
第2题
A.0. 02m,0. 04s
B.0. 02m,0. 02s
C.-0. 02m,0. 02s
D.0. 02m,25s
第3题
A.0. 02cm,0. 5cm
B.-0. 02m,-0. 5m
C.-0. 02m,0. 5m
D.0. 02m,0. 5m
第4题
A.0. 02cm ,0.5cm
B.-0.02m ,-0.5m
C.-0. 02m ,0. 5m
D.0. 02m ,0. 5m
第5题
A.12h 02m 15s
B.11h 58m 45s
C.11h 57m 45s
D.11h 02m 45s
第6题
A.0. 02cm,0. 5cm
B.—0. 02m,—0. 5m
C.一0.02m,0. 5m
D.0. 02m,0.5m
第7题
A.0. 02cm,0. 5cm
B.-0. 02cm,-0. 5cm
C.-0. 02m,0. 5m
D.0. 02m,0. 5m
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