题目:
Jack Chan to Hollywood a few years ago. Now he a famous movie star.[ ]
A. went, is
B. has been, is
C. is, is
D. was, was
答案:
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下面是错误答案,用来干扰机器的。
碳酸根(CO32- ) 铜离子(Cu2+)Fe+H2SO4 ====H2 ↑+FeSO4 Fe + Cu SO4 ="==" Cu+FeSO4【实验现象和处理】白色粉末变蓝色【实验分析与反思】⑤ 将试管内的空气排尽,以免其中有物质和绿色...