character: Welding Instructor
topic: Welding Basics: An Introduction
grade: 11
subject: Chemistry
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character: Chemistry Teacher
topic: Chemical Properties of Acetylene in Welding
grade: 11
subject: Chemistry
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character: Safety Officer
topic: Safety Measures When Using Acetylene
grade: 11
subject: Chemistry
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character: Welder Apprentice
topic: Understanding Acetylene Torch Operations
grade: 11
subject: Chemistry
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