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【单选题】
归纳起来,目前世界范围内医疗保障制度主要有()种模式。A.
二
B.
三
C.
四
D.
五
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【简答题】For all dinner tables, a glass of milk seems to be a must. At least it was when I was growing up. It is widely believed that milk is a must in building strong bones and teeth. There’s no doubt that da...
【单选题】下列浓度为 0.1 mol·L -1 的溶液,可用 0.1 mol·L -1 HCl 标准溶液准确滴定的是
A.
NaAc ｛已知 pK a (HAc)=4.75 ｝
B.
羟胺 (pK b = 8.04 )
C.
苯甲胺 (pK b =4.67)
D.
苯甲酸钠｛已知 pK a ( 苯甲酸 ) = 4.21 ｝
【多选题】常温下，用 0.1 mol·L —1 HCl溶液滴定10.0 mL浓度为0.1 mol·L —1 Na 2 CO 3 溶液，所得滴定曲线如图所示。下列说法正确的是
A.
当V＝0时：c(H ＋ )＋c(HCO 3 － )＋c(H 2 CO 3 )＝c(OH － )
B.
当V＝5时：c(CO 3 2— )＋c(HCO 3 － )＋c(H 2 CO 3 )＝2c(Cl － )
C.
当V＝10时：c(Na ＋ )＞c(HCO 3 － )＞c(CO 3 2— )＞c(H 2 CO 3 )
D.
当V＝a时：c(Na ＋ )＞c(Cl － )＞c(H ＋ )＝c(OH － )
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