第12题: [单项选择]血性痰最常见的病因是() A. 支气管扩张 B. 支气管肺癌 C. 肺结核 D. 肺脓肿 E. 肺吸虫病 参考答案:C
第13题: [单项选择]A man aboard a vessel,signaling by raising and lowering his outstretched arms to each side,is indicating(). A. danger,stay away B. all is clear,it is safe to pass C. the vessel is anchored D. a distress signal 参考答案:D