根据首字母或汉语提示写出单词

1. His son is c_____ endless problems and he's close to the end of his rope.

2. The earthquake caused great d_____ to people of Wenchuan.

3. It takes a lot of time and e______ to get an exhibition ready.

4. The company is run by a group of _____ (主任).

5. No one knows whether Mr. Li lives on the _____ (八) floor of this building.

制动器是制动系统中用以产生阻碍车辆运动或运动趋势的力的部件