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"For example, what did we talk about last class regarding fire scene investigation?"

Instructor Fang turned around and wrote on the blackboard:

Visible and invisible indicators.

"These are the two categories of fire situation investigation."

Having written this, Instructor Fang tossed the chalk onto the desk with a flourish and said with a smile:

"This connects to today's lesson. The initial firefighting force arrives on scene, identifies the building type, which starts from the pre-planning stage and becomes specific when the fire occurs.

Following the judgment on building structure," Fang Huai said one thing right, observe around the scene.

Firstly, it's about smoke."

Instructor Fang picked up the chalk again and began to write emphatically on the blackboard.

"In observing around the scene, the shape of the smoke partially indicates what the primary fuel is. As for which type of fuel corresponds to which smoke shape, that's in the book, we won't go into detail.