问题
问答题 简答题
液压缸活塞杆在运动中产生冲击现象有哪些原因?
答案
参考答案:
①活塞与液压缸间隙大
②节流阀失去调节作用
③单向阀失灵,不起缓冲作用
④纸垫破损造成泄漏
液压缸活塞杆在运动中产生冲击现象有哪些原因?
参考答案:
①活塞与液压缸间隙大
②节流阀失去调节作用
③单向阀失灵,不起缓冲作用
④纸垫破损造成泄漏
Directions: This part is to test your listening ability. It consists of 3 sections.
Section A
Directions: This section is to test your ability to understand short dialogues. There are 5 recorded dialogues in it. After each dialogue, there is a recorded question. Both the dialogues and questions will be spoken only once. When you hear a question, you should decide on the correct answer from the 4 choices marked A), B), C) and D) given in your test paper. Then you should mark the corresponding letter on the Answer Sheet with a single line through the center.
A.In a ware house.
B.In a gas station.
C.In a department store.
D.In an office.