曳引轮位置偏差，前、后（面向对重）方向不应超过±（）mm。
A.5
B.4
C.3
D.2
参考答案：D
用介词in，at，on填空。
1. Dick and Tony often go to school _____ 7:30 every day.
2. Let's go and see the football match _____ the evening.
3. Will a new film be on _____ New Times Cinema?
4. Lily usually has English classes _____ Saturday morning.
5. My parents always have a walk _____ the park after supper.
恙虫病的主要传染源是（）
A.螨
B.鼠
C.猪
D.蚤
E.蚊
and see the football match _____ the evening.