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