According to needs and delivery medium, can be used two kinds of mechanical seals and packing seal, and the structure of these two kinds of interchangeability.
根据需要和输送介质，可采用机械密封和填料密封两种，且这两种结构具有互换性。
2
Analyzed problems occurred in filler sealing of pump pressurized device used in gather and delivery system, found out causes and made revamp scheme for mechanical seal.
分析集输系统所用的机泵增压设备填料密封出现的问题，找出原因，制订机械密封改造方案。
3
The mail room personnel create an envelope by using the recipient information in your letter, seal your letter in an envelope, and drop the envelope in the mailbox for delivery.