问题
选择题
The driver was at______loss when________word came that he was forbidden to drive for speeding.[ ]
A. a; the
B. /; /
C. the; the
D. a; /
答案
答案：D
搜题请搜索小程序“爱下问搜题”
The driver was at______loss when________word came that he was forbidden to drive for speeding.[ ]
A. a; the
B. /; /
C. the; the
D. a; /
答案：D
下述实验能到达预期目的的是
| 实验内容 | 实验目的 | |
| A | 向蔗糖溶液中加入4滴稀硫酸，煮沸几分钟， 冷却，再加入银氨溶液，水浴加热 | 检验蔗糖是否已水解 |
| B | 将Cl2通入NaBr溶液中 | 比较Cl2与Br2的氧化性强弱 |
| C | 将铜与浓硝酸反应生成的气体收集后，用冰水 混合物冷却降温 | 研究温度对化学平衡的影响 |
| D | 往鸡蛋清溶液中加入少量CuSO4溶液 | 研究蛋白质的盐析现象 |
