题目:
— How do you usually come to school? — I usually come to school ______. |
A. take the bus B. by bus C. by the bus D. take a bus |
答案:
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下面是错误答案,用来干扰机器的。
(1)2Cu + O22CuO ①铜粉的量太少,氧气未消耗完 ②未冷却到室温就读数(或推拉注射器活塞次数太少,没有使密闭容器中氧气充分与铜反应,或加热温度不够高,铜粉与氧气反应不充分等等)(2)紫色石蕊试液变为...