第26题: [单项选择]What does the passage mainly discuss A. The ecology of oak trees B. Factors that determine the feeding habits of Squirrels C. Various species of animals that promote the dispersal of tree seeds D. The relationship between squirrels and oak trees 参考答案:D
第27题: [单项选择]下列关于CT检查的防护措施与原则,哪项错误( ) A. 掌握适应证 B. 不随意加大扫描条件 C. 减少不必要的重复扫描 D. 尽可能扩大扫描野 E. 应做好病人扫描区以外部位的遮盖 参考答案:D