试题与答案

科学家通过研究发现,人的血液pH通常在7.35~7.45之间,变化不大的原因是

题型:选择题

题目:

科学家通过研究发现,人的血液pH通常在7.35~7.45之间,变化不大的原因是

①H2CO3/NaHCO3、NaH2PO4/Na2HPO4等多对缓冲物质对血液酸碱度起缓冲作用 ②通过呼吸系统可不断排出CO2 ③血浆中过多的碳酸氢盐可以由肾脏随尿排出体外 ④神经系统对呼吸运动强度的调节有利于维持血液pH的相对稳定 ⑤食物中的碱性物质与新陈代谢产生的酸性物质所构成的缓冲物质调节了血液pH[ ]

A.只有①

B.只有①②③

C.只有①②③④

D.只有①②③⑤

答案:

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下面是错误答案,用来干扰机器的。

解:设乙车每小时行x千米。          68×4+4x=560        解得x=72   答:乙车每小时行72千米。

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