第28题: [单项选择]转向横拉杆两端螺纹旋向是() A. 左旋 B. 右旋 C. 一个左旋、一个右旋 参考答案:C
第29题: [单项选择]Which of the following is NOT ranked among the top four, according to the diagram A. Abuse and violence. B. Aging services. C. Reproductive health services. D. Substance abuse services. 参考答案:B 答案解析:[题解] 根据提问,应该仔细阅读表格中所列的相关的项目。