48. According to article, which of the following cases will be considered relatively harmless?
(A)When a mass of solid materials is grounded into a fine powder and intimately mixed with air in the form of dust cloud.
(B) When a mass of materials is released rapidly with ignition.
(C) When a mass of materials is dissipated with gaseous effect.
(D) When a mass of solid materials is heated gradually and slowly.

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統計： A(9), B(13), C(14), D(48), E(0) #868035

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#2959025
When a mass of solid...
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根據文章，下列哪個情況將被認為是相對無害的？
(A) 當固體材料的塊狀物被磨成細粉並與空氣密切混合成塵雲時。
(B) 當固體材料的塊狀物在點燃時迅速釋放。
(C) 當固體材料的塊狀物以氣體形式消散。
(D) 當固體材料逐漸緩慢加熱時。

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