第12题: [单项选择]People are finding less and less time for relaxing themselves because ______. A. they do not know how to enjoy themselves B. they do not believe that relaxation is important for health C. they are traveling fast all the time D. they are becoming busier with their work 参考答案:D 答案解析:文章前两句话“As the pace of life continues to increase,we are fast losing the art of relaxation. Once you
第13题: [单项选择]胸部CT导向穿刺体位要求:() A. 仰卧正位 B. 俯卧正位 C. 侧位 D. 斜位 E. 任选适当体位 参考答案:E
第26题: [单项选择]整条肽链中全部氨基酸残基的相对空间位置是() A. 蛋白质一级结构 B. 蛋白质二级结构 C. 蛋白质三级结构 D. 蛋白质四级结构 E. 单个亚基结构 参考答案:C 答案解析:蛋白质多肽链中氨基酸的排列顺序称为蛋白质的一级结构;蛋白质的二级结构是指多肽链主链局部的、有规则的重复空间构象,不涉及氨基酸侧链的构象;蛋白质的三级结构是指蛋白质分子或亚基内所有原子的空间排列,既包括