题目：
下列物质与水混合充分搅拌后能导电的是 [ ]
A．碳酸钙
B．酒精
C．氢氧化铜
D．硫酸钠
答案：
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My mother has been a music teacher in a primary school for nearly 20 years. She finished college at the age of 22 and chose to work as a teacher. She is well respec...
