问题
多项选择题
人工燃气按制取方法不同，可分为（）。
A．裂化燃气
B．气化燃气
C．液化石油气
D．干馏燃气
答案
参考答案：A, B, D
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人工燃气按制取方法不同，可分为（）。
A．裂化燃气
B．气化燃气
C．液化石油气
D．干馏燃气
参考答案：A, B, D
Until 1954 it was thought that no man could run one mile in less than four minutes.As years went by, the record came closer and closer to four minutes and Roger Bannister，a young English athlete, began to believe he might __11__ this almost magic barrier. It was a cold afternoon on May 6th, 1954, when Bannister knew he had a __12__ chance.Bannister had been __13__ hard and was very fit, but the weather conditions were a real __14__ to him.Describing the __15__ later, Bannister said, “On the way to the track the wind blew strongly.As I __16__ up for the start I glanced at the flag.It moved __17__ now.This was the moment when I made my decision.” “The gun fired.My legs seemed to meet no resistance，as if I was __18__ forward by some unknown force.The noise from the faithful __19__ gave me greater strength.I felt the __20__ of a lifetime had come.” “I was driven on by a __21__ of fear and pride.My body had long since used up all its energy but it went on running just the same.This was the critical moment when my legs were strong enough to carry me over the last few yards as they never could have done in previous years.When I leapt at (冲向) the __22__ tape, I fell, almost __23__.” “I knew I had done it, even before I __24__ the time.The announcement came, ‘Result of the one mile...Time，three minutes...’ the rest was __25__ in the noise of excitement.”
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从下列事实所得出的相应结论正确的是（ ）
| 实验事实 | 结论 | |
| ① | 在相同温度下，向1 mL 0.2 mol·L－1 NaOH溶 液中滴入2滴0.1 mol·L－1 MgCl2溶液，产生 白色沉淀后，再滴加2滴0.1 mol·L－1 FeCl3 溶液，又生成红褐色沉淀 | 溶解度：Mg(OH)2＞Fe(OH)3 |
| ② | 将CO2通入到Na2SiO3溶液中产生白色浑浊 | 酸性：H2CO3＞H2SiO3 |
| ③ | 已知反应5Cl2＋I2＋6H2O=2HIO3＋ 10HCl,2BrO＋Cl2=2ClO＋Br2 | 氧化性强弱顺序：BrO＞Cl2＞ClO＞IO |
| ④ | 测定等物质的量浓度的Na2SO4与Na2CO3溶 液的pH，后者较大 | 非金属性：S＞C |
A.③④ B．②④ C．①②③ D．全部