第10题: [单项选择]Opponents of our present tax program argue that it discourages from trying new fields of business activity. A. entrepreneurs B. sportsmen C. colonists D. mediators 参考答案:A 答案解析:[试题分析] 词义辨析。
[详细解答] 句中的tax program和business activity只与entrepreneurs有必然联系。entrepreneurs实业家;sportsmen
第34题: [单项选择]血浆中含量最多、缓冲能力最强的缓冲体系是______ A. Na+/H+ B. Na2HPO4/NaH2PO4 C. NaHCO3/H2CO3 D. K2HPO4/KH2PO4 E. KHCO3/H2CO3 参考答案:C 答案解析:[解析] 血浆中的NaHCO
3
含量最多,故血浆缓冲对以NaHCO
3
/H
2
CO
3
为主。故选C。