第28题: [单项选择]慢性呼吸衰竭失代偿期,给氧的原则是() A. O2浓度25%~30%,氧流量1~2L/min,间断给氧 B. O2浓度35%~40%,氧流量3~4L/min,间断给氧 C. O2浓度35%~40%,氧流量3~4L/min,持续给氧 D. O2浓度25%~30%,氧流量1~2L/min,持续给氧 E. 以上都不是 参考答案:D
第30题: [单项选择]The boss sent Mr. Black to China on business because ______.[A] Mr. Black had never been to China before[B] Mr. Black was an able and hardworking man[C] Mr. Black could buy something interesting for Tony 参考答案:B 答案解析:[解析] 布莱克很能干,工作也很努力,他的老板很赏识他,所以才送他去中国出差。