男性，60岁，慢性咳嗽、咳痰20年，受凉后症状加重伴明显气短1周入院。血气分析示：pH7．30，PaCO2270mmHg，PaO246mmHg，立即给予持续低流量吸氧
持续低流量氧疗的机制为（）
A.缺氧时组织摄氧量增加
B.缺氧时血红蛋白代偿性增加
C.维持低氧对颈动脉窦、主动脉体的刺激作用
D.缺氧时，心率加快增加氧的运输
E.利用氧解离
参考答案：C
| 根据短文内容，从方框内选择合适的单词并用其适当形式填空，使短文完整、连贯。 | |
Twice in the 20th century, the city was (3)______ and rebuilt (重建). In 1923, there was a great earthquake in the city. (4)______ of people were killed and millions left homeless. It (5)______ people there seven years to rebuild the city. During World War ?, Tokyo was destroyed once again. After the disasters (灾难), nothing (6)______ in the downtown area of old Tokyo. After the war, the people of Tokyo began to rebuild their city. The city was (7)______ at a high speed (高速地) between 1945 and 1960, and the city's population (8)______ very fast. As a result of this quick development, however, many problems have (9)______, such as housing shortage (短缺), pollution and unemployment (失业). But the government has (10)______ several programs to solve them. |