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Four-Stroke Engine Internal Combustion Engine Model Engine Small Fuel Engine Diesel Engine Model Physics Experiment Equipment Teaching Instrument Diesel Engine Model Working Principle Purpose: Used for teaching demonstration of heat engine part of physics class in middle school. Features:It can clearly explain the basic working principle of four-stroke single-cylinder gasoline engine and the main structure of common... Four-Stroke Engine Internal Combustion Engine Model Engine Small Fuel Engine Diesel Engine Model Physics Experiment Equipment Teaching Instrument Diesel Engine Model Working Principle