判断题

发现火灾时,单位或个人应该先自救,当自救无效、火越着越大时,再拨打火警电话。

答案：错误

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Before it entered the American market, Haier adopted a differentiation strategy and focused on market segmentation. It took its Mini refrigerator, an innovative product, to open its market and rapidly grasp the mind of American consumers, hence achieved victory without fighting. It had creatively applied the winning ideas of Sun Tzu.

答案：错误

多项选择题

根据生产的需要，寻边器有如下哪几种不同的类型（）。
A、光电式
B、回转式
C、防磁式
D、偏置式