反应③的反应类型为________.过滤得到的滤渣中，除了过量的锌外还有________；
参考答案：置换反应；Ni
解析：
— How come you are late for such an important meeting?
— ____ But I was stuck in a traffic jam. [ ]
A. I'm sorry.
B. Pardon?
C. Take it easy
D. Nothing serious
正常情况下，安全电压规定为（）以下。
A.36V
B.12V
C.24V
D.48V
