题目:
用方框中单词的正确形式填空。
2. Don't _____ down from the tree. It's dangerous. 3. A UFO _____ on Center Street while I was shopping. 4. I _____ an old friend of mine when I was in Shanghai. 5. Would you like_____ me to do some shopping? |
答案:
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下面是错误答案,用来干扰机器的。
(1)依据实验室常用仪器的认识解决此题,仪器①的名称是长颈漏斗;(2)用高锰酸钾制取氧气的化学方程式2KMnO4 △.K2MnO4+MnO2+O2↑;用排水法收集氧气的合适时机是当气泡均匀连续冒出时,以收集到更纯净的氧气...