推土机的检修所应遵守的安全规定叙述错误的是（）。
A、应在平整的地面上进行
B、启动发动机
C、检查刮板时，应将其放稳在垫板上
参考答案：B
逻辑题。
1. A man sells water. What does he first think of when he sees a river?
Answer: _____
2. A car travels at a speed of 40 mph over a certain distance and then returns over the same distance
at a speed of 60 mph.What is the average speed for the total journey?
根据营养支持的途径分为______和______。
