问题
多项选择题
能使心肌氧供减少的因素有（）
A.心功能不全
B.扩张冠状动脉
C.2，3-DPG增加
D.贫血
E.缺氧
答案
参考答案：A, D, E
搜题请搜索小程序“爱下问搜题”
能使心肌氧供减少的因素有（）
A.心功能不全
B.扩张冠状动脉
C.2，3-DPG增加
D.贫血
E.缺氧
参考答案：A, D, E
请填表，并根据下表回答有关问题．（除第（2）小题外，其余均用序号填写）
| 序号 | ① | ② | ③ | ④ |
| 物质名称 | 锌粒 | 熟石灰 | 干冰 | |
| 化学式 | H2SO4 |
（2）用表中的物质作为反应物，写出符合下列要求的化学方程式：
①实验室制取氢气______
②实验室检验④______
（3）表中含-l价原子团的物质为______．
My chance came at last. Our school was going to hold a sports meeting. I knew what it 51 to me, so I got up very early to prepare for it. I 52 running and jumping. When I was 53 , I 54 myself of my promise and went on. As the time approached, I felt quite 55 . On the first day I 56 fourth in the 1500m race, but I was far from 57 because what I wanted most was the highlight of the sports meeting—250×8 relay race. I would run the last leg for my team. With a shot, the race began. All the students were 58 for their team. The competition was so 59 that I began to feel nervous. Before my turn came, my team was 60 the others. Even worse, I almost dropped the stick when I was trying to 61 it. 62 after that, there was nothing in my mind except to run as fast as possible. Just when I was approaching the finish line, my legs 63 . Then my promise came to mind again and 64 me on. To my 65 , I was the first to cross the finish line! 66 , I had proved to myself and those who had often laughed at me that I am not 67 at all! My classmates greeted me warmly and I hugged them tightly. I had won the prize as well as their 68 . From the sports meeting, I learnt that sometimes things are not so difficult as they 69 to be. Just try your best without fear and you might be surprised at the 70 .
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