A. 9V B. 13V C. 14V D. 16V
A. 杨利伟是中国首位宇航员 B. 景海鹏完成首次出舱行走 C. 刘洋是中国第二位女航天员 D. 神舟九号首次开展我国航天员太空授课活动
A. 测量范围 B. 流速 C. 设计流量
A. whose wife I met B. I met whose wife C. I met his wife D. his wife I met