第21题: [单项选择]呼吸性酸中毒() A. pH下降,HCO-3下降 B. pH升高,PaCO2升高,HCO-3下降 C. pH下降,PaCO2升高 D. pH升高,PaCO2下降,HCO-3下降 E. pH升高,HCO-3升高,BE升高 参考答案:C 答案解析:pH、HCO、PaCO,是反映机体酸碱平衡的三大基本要素,pH下降为酸中毒,pH升高为碱中毒。HCO是反映代谢性因素,其原发性减少或增加,可引起代谢性酸中毒或代谢性碱中毒。PaCO是反映呼吸性因素的指
第33题: [单项选择]During the industrialized twentieth century, the role of women _________. A. was strengthened B. was as important as early C. was decline D. was more reinforced than early days 参考答案:C 答案解析:文章第四段第一句中的not as…as表示“不如”,而C项中declined是“下降了”,两者意义上相同。A和 D项都表示“加强了”,与原文意义相反。