第14题: [单项选择]低分子右旋糖酐的主要作用是 A. 降低血液黏稠度,改善微循环 B. 提高血浆胶体渗透压 C. 补充蛋白质,改善微循环 D. 补充营养和水分,减轻水肿 E. 供给热能,保持酸碱平衡 参考答案:A 答案解析:低分子右旋糖酐属于胶体溶液,分子量较中分子右旋糖酐小,其溶液在血管内存留的时间长,因此可以降低血液黏稠度,减少红细胞聚集,改善血液循环和组织灌输量。
A. they are good at doing things they are not fond of B. they would .like to do something they are not good at C. they think they are good at nothing and do not know what they can do D. all of the above 参考答案:D 答案解析:细节题。答案在第二段。文中提到的这三类人都感到不快乐。