问题
选择题
It has a big face, no feet , but can walk. What is it?[ ]
A. match
B. watch
C. clock
答案
答案：C
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It has a big face, no feet , but can walk. What is it?[ ]
A. match
B. watch
C. clock
答案：C
是一种重要的染料及农药中间体。某学习小组以孔雀石（主要成分为Cu2(OH)2CO3,含少量Fe2O3和SO2杂质）为原料制备该物质的流程如下：
键和
键的个数比为______
的配位键____________。