对日本，1949年美国为其制定了经济复兴的（），向日本提供大量贷款和援助。
参考答案：道奇路线
The school survey showed that the students' attitudes to how to deal with difficulties in life widely. [ ]
A. fell
B. varied
C. expanded
D. spread
简明说明一下制动器合闸力由谁产生并简述工作过程。
