Fuel injection valves should be taken out， cleaned， and lifting checked every （）.
举一反三
- what objects should be taken out to be checked when you go through security check ？
- We'll go out as soon as I've the kitchen. A: cleaned up B: worked out C: checked on D: sent for
- We'll go out as soon as I've the kitchen. A: cleaned up B: worked out C: checked on D: sent fo
- Failure of fuel injection is usually due to trouble in the （）.
- What should the Bellman say to guests who have checked out and are leaving the hotel?