初级卫生保健的基本原则（） A.社会公正 B.社区参与 C.成本效果和成本效益 D.

根据短文内容，从方框中选出能填入空白处的最佳选项。(选项中有两项为多余选项) Saying Goodbye Many people were waiting for the train. Some were reading newspapers and some were saying goodbye to their friend． Doctor Smith, Mr. Lee and Mr. Brown were talking so happily that ____16____ Then the guard called loudly, “The train is going to leave. ____17____ The three men heard the guard and two of them jumped onto the train quickly before it moved. One was left behind. It was Dr. Smith. He ____18____ The guard came to him and said, “Don’t worry. ____19____ ”“I know.” Dr Smith said，“ ____20____ My friends only came to say goodbye to me. ” A. But it is my train. B. they didn’t know the train was going to leave. C. was very excited. D. Hurry up, please. E. looked very sad. F. The next train will come in ten minutes. G. Take your time.

一根长直细杆长1.7m，从某一高处作自由落体运动，在下落过程中细杆通过一个1.75m高的窗口用时0.3s，求细杆刚下落时其下端到窗口上边缘的高度．（g取10m/s²，窗口下边缘到地面的高度大于细杆的长度）

体现知情同意原则的是（）

A.第一株中国人胚胎干细胞系建系成功，使中国人成为少数几个拥有人胚胎干细胞的国家。该研究使一些不治之症如白血病等完全可以根治

B.患者有权选择接受或拒绝医生制定的治疗方案

C.确定的医学科学研究的课题要与国家经济发展的实际和医学技术的实力相符合

D.受试者对人体实验过程及其后果应有一定的了解，其意愿和选择应当受到重视

E.耐心细致的宣传解释仍无法满足死者亲属的要求，这时尸检人员应放弃尸检

网络负载G

某城市居民人均收入自2007年3月1日至2007年9月30日由1500元增加到1600元，某类商品住宅的需求量由20万套上升到22万套。则该类商品住宅的需求富有弹性。( )