问题
选择题
The child had only _____ slight temperature,but the doctor regarded the illness as serious enough for ____ hospital treatment.
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答案
答案:C
The child had only _____ slight temperature,but the doctor regarded the illness as serious enough for ____ hospital treatment.
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答案:C
某实验测出的人的呼吸中各种气体的体积分数如下表所示
气体 | 吸入气体 | 呼出气体 |
X | 78% | 75% |
Y | 21% | 15% |
CO2 | 0.03% | 3.68% |
H2O | 0.06% | 5.44% |
其他 | 0.91% | 0.88% |
(2)请你回答:参与人体新陈代谢而消耗的气体是______.(填化学式)
(3)请你证明呼出的气体中含有水蒸气.你的实验方法______.
(4)请你分析:X气体在呼吸过程中没有参与化学反应,但在呼出气体中体积分数却减少,原因是______.