EXERCISE 1

1. T 2. F 3. F 4. F 5. T 6. F

EXERCISE 2

1. 气门机构 2. pushrod engine 3. 气门弹簧 4. timing chain

5. 气门锥面 6. steel alloy 7. 气门座

8. timing belt 9. 挺柱 10. at high engine speed

EXERCISE 3

1. valve 2. valve train 3.intake and exhaust ports 4. valve face

5. push rods 6. rocker arm 7. camshaft 8. valve spring

EXERCISE 4

1. C 2. A 3. D 4. E 5. B 6. F

EXERCISE 5

1. transmit the force from the camshaft to the pushrods

2. the intake valves heat less during engine operation

3. the valve spring provides the force necessary to close the valve

4. the valve train should undergo regular maintenance

5. the more power strokes produced for each revolution

EXERCISE 6

1. engine operation 2. valve rotator 3. grooves 4. freely 5. which

6. is compressed 7. causes 8. against 9. roll down 10. the valve

EXERCISE 7

1. C 2. F 3. A 4. I 5. B 6. D 7. J 8. E 9. G 10. H

EXERCISE 8

1. 顶置双凸轮轴 2. 顶置单凸轮轴 3. 顶置气门 4. 电子控制装置

5. 三菱新气门相位和升程电子控制装置 6. 智能可变气门相位

7. 智能可变气门相位和升程电子控制装置 8. 可变气门升程

EXERCISE 9

1.

1）out of alignment 2）tires

2.

1）low 2） the transmission