液压缸的结构基本上可以分为缸筒、缸底、活塞、活塞杆、缸盖、密封装置、（）和排气装置等。
参考答案：缓冲装置
34. By no means _____ of our students to drop out of school.
A．will we allow
B．we will allow
C．we allow
D．must we allow
—It sounds to me as if he knows a lot about computers.
—He is a person who is fond of________.
A．showing up
B．making up
C．showing off
D．making out
