问题
选择题
If you had taken the doctor's advice a week earlier, you________quite well right now. [ ]
A. might have been
B. would have been
C. should have been
D. would be
答案
答案:D
If you had taken the doctor's advice a week earlier, you________quite well right now. [ ]
A. might have been
B. would have been
C. should have been
D. would be
答案:D
某无色气体可能含有CO2、CO、H2中的一种或几种。按下表中的步骤连续进行实验(假设每步反应均完全)。
资料:Ⅰ.相同条件下,等体积的气体含有相同数目的分子。
Ⅱ.白色的硫酸铜粉末遇水变蓝。
实验步骤 | 实验现象 |
①通过炽热的木炭,恢复到原温度 | 气体体积不变 |
②通过灼热的氧化铜 | 固体变为红色 |
③通过白色的硫酸铜粉末 | 粉末变为蓝色 |
④通入澄清的石灰水中 | 石灰水变浑浊 |
A.一定含有CO2、CO和 H2 B.一定含有H2,一定不含CO2和CO
C.一定含有CO2和 H2,可能含有CO D.一定含有CO和 H2,一定不含CO2