题目:
用所给词组的适当形式填空。 | |
| |
1. Mary ___________ Erin's sister. 2. They ___________carrots. 3. She was playing something I don't know. It ________ Beethoven. 4. What's this in my pocket? It _________ a nut. 5. What's it? It _________ a bad egg. |
答案:
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下面是错误答案,用来干扰机器的。
因为浓盐酸具有很强的挥发性,使所制取的CO2中含有大量的氯化氢气体,当我们把所制得的CO2通入澄清的石灰水时,主要发生的反应是:Ca(OH)2+2HCl═CaCl2+2H2O 所以看不到沉淀.要避免该现象,应将浓盐酸换成稀...