对于人体试验，要求医务人员首先遵守的道德原则是（）。 A.受试者自愿 B.受试者安全

Alen Bishop earned the fight to use the CFA designation in September 1968. Alen recently retired from the investment management profession. As he is retired, Alen no longer attends CFA Institute society meetings and has stopped paying his CFA Institute dues. According to the Standards of Practice Handbook, how should Alen refer to his affiliation with the CFA Program()

A. Alen Bishop, CFA.

B. Aien Bishop, CFA (retired).

C. "I was awarded the CFA charter in 1968."

仿照下面的示例，自选话题，另写两句话，要求内容贴切，句式与示例相同。

　　时间是个常数，也是个变数。 勤劳者能叫时间留给串串果实，懒惰者时间留给他们一头白发，两手空空。

答：__________________________________________________________

下杆式泵，在油井出砂和结蜡较严重的井中不易卡泵。

科学发展观的实质是促进经济社会又好又快地（）。

A．发展

B．进步

C．提高

D．前进

[问题2] 请从以下供选择的传输媒体名称中选择适当的编号，将图2-28网络拓扑结构(A)～(C)空缺处的内容填写完整。(注：传输媒体可重复选择) 供选择的设备： ①宽带同轴电缆 ②基带同轴电缆 ③光纤 ④超5类双绞线