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【单选题】
基础生命支持的主要步骤中，A代表A.
开放气道
B.
人工呼吸
C.
心脏按压
D.
电除颤
E.
.以上均错
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【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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