科普英语注释读物 农机是怎样工作的PDF电子书下载

Introduction 1

The Tractor 3

Engine Governors 4

Transmission,Wheels and Tracks 7

Wheel Grip 8

Power Take-off 11

Three-point Hydraulic Lift 12

Manure and Fertilizer Spreading 14

The Plough 17

Cultivating the Land 19

Sowing the Seed 20

The Combine Harvester 22

How the Combine Harvester Works 23

Drying the Grain 26

Haymaking 28

Balers 30

Forage Harvesting 31

Crop Spraying 32

The Tractor Tool Bar 34

Planting Potatoes 36

Digging up Potatoes 38

Milking Machines 39

How the Milking Machine Works 41

Other Machinery 42

Vocabulary 45