第15题: [单项选择]肾在维持酸碱平衡中最主要的作用是() A. 直接排出酮体 B. 排H+保Na+ C. 重生HCO3-以恢复血中HCO3-浓度 D. 排出乳酸 E. 排出铵盐 参考答案:B 答案解析:肾小管通过分泌H+、重吸收HCO3-在调节机体酸碱平衡方面起着重要作用。近曲小管、远曲小管和集合管的上皮细胞都能够主动分泌H
A. His father scolded him severely. B. His father took back the six dollars. C. His father made him do the cutting again. D. His father cut the weeds himself. 参考答案:C