49. According to the article, what will be the primary factor that causes deaths and injuries when dust explosion takes place in factories?
(A) increase of pressure wave
(B) collapse of factory buildings
(C) lack of emergency aids
(D) insufficiency of professional knowledge

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統計： A(79), B(15), C(9), D(9), E(0) #868036

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In factories it is t...
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根據文章，當塵爆發生在工廠時，主要導致死亡和傷害的因素是什麼？
(A) 壓力波增加
(B) 工廠建築倒塌
(C) 缺乏緊急救援
(D) 專業知識不足

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