A. ①② B. ①④ C. ②④ D. ②③ 参考答案:C 答案解析:国有经济是我国国民经济的支柱，控制国民经济命脉，对经济发展起主导作用.国有经济的主导作用体现在控制力上，即控制国民经济的发展方向、控制经济运行的整体态势、控制重要稀缺资源的能力上，即关系国计民生的重要
第21题: [单项选择]An 18-month-old child is brought to the emergency department with suspected croup. The child appears frightened and cries as the nurse approaches him. The nurse needs to assess the child's breath sounds. The best way to approach the child is to 参考答案:D 答案解析:Toddlers are naturally curious about their environment and letting them handle minor equipment is di
