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【简答题】
10 设有两种报警系统Ⅰ与Ⅱ，它们单独使用时有效的概率分别为 0.92 与 0.93 ，且已知在系统Ⅰ失效的条件下，系统Ⅱ有效的概率为 0.85 ，求：系统Ⅰ与Ⅱ同时有效的概率？
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【单选题】Function of the Lungs Blood vessels running all through the lungs carry blood to each air sac, or alveolus (肺泡), and then back again to the heart. Only the thin wall of the air sac and the thin wall o...
A.
Nitrogen is absorbed from the air
B.
About one-fifth of the carbon dioxide and about one-half of the oxygen in the air goes into the blood
C.
The moisture in the air is almost completely evaporated
D.
About one-fifth of the oxygen in the air goes into the blood and an equivalent amount of carbon dioxide enters the air from the blood
【简答题】In lungs, each bronchiole terminates in a small group of air sacs, called _______.