当发生电气火灾时，应该怎么做？
参考答案：
应立即断开电源，并采用专用的消防器材进行灭火。
When you are confused about some word in reading, you can _____ the dictionary. [ ]
A. refer to
B. look up
C. check
D. have a look at
简述双轴振动筛的工作原理。
