问题
选择题
— Really? Who will give _____ lecture?
— Mr Wang, _____ famous professor from Nanjing University. [ ]
A. the; /
B. a; the
C. the; a
D. a; a
答案
答案：C
搜题请搜索小程序“爱下问搜题”
— Really? Who will give _____ lecture?
— Mr Wang, _____ famous professor from Nanjing University. [ ]
A. the; /
B. a; the
C. the; a
D. a; a
答案：C
平静呼吸时，一般成年人每次吸入和呼出的气体量相等，约为500ml．气体成分测定和分析表明：吸入气、呼出气中各种气体成分的百分比大致如下表所示：
| 气体成分% | 氮气 | 氧气 | 二氧化碳 | 水蒸气 | 其它 |
| 吸入气体% | 78 | 21 | 0.03 | 0.01 | 0.96 |
| 呼出气体% | 78 | 16.4 | 4.63 | 0.03 | 0.94 |
| 实验步骤 | 实验现象 | 结论 |
| 呼出的气体中含有二氧化碳 | ||
| 呼出的气体中含有水蒸汽 |