Unit 1 The Basic Components of an Automobile Unit 2 Instrument Panel Unit 3 Body Structure Unit 4 Piston and Power Unit 5 The Positions of the Key in the Ignition Switch Unit 6 Shift Lever Positions and O/D Switch Unit 7 Automobile Inspection Equipment Unit 8 Looking for Leaks Unit 9 Testing or Charging Unit 10 Automobile Maintenance Unit 11 Engine Cooling System Unit 12 How to Read Circuit Diagram Unit 13 Air Conditioning System Unit 14 Computer in Car Unit 15 The Computer-controlled Suspension System Unit 16 Antilock Braking System Unit 17 Hybrid Electric Vehicles （HEV） Unit 18 Automobile Sales Unit 19 Automobile After-Sales Service Unit 20 Controlling Pollution of Vehicles MODEL TEST 1 MODEL TEST 2 MODEL TEST 3 MODEL TEST 4 MODEL TEST 5
