A. new market standards B. new political structures C. organizational structures D. decrease in transportation and communications costs 参考答案:A 答案解析:[解析] 文章第二段最后一句提到,Meeting these standards requires great changes in organizational structures,skill n
第17题: [单项选择]下述哪项不是心力衰竭发病因素() A. 心肌梗死 B. 高血压病 C. 低钾血症 D. 风心病 E. 心肌病 参考答案:C