简单介绍一下打印针的作用和寿命，以后还待补充。
... print member 印字构件 print needle 打印针 print on demand 按需打印，按需出版，[港]自x印刷服 ...
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用于制作引出线，支撑杆，打印针等。
本文介绍了电子打印机用高韧性硬质合金打印针的研制与开发。
The present paper has introduced in detail the pilot production and research and development of cemented carbide printing needle with high ductility used for electronic printer.
打印机主要有三种类型？针式、喷墨和激光。
There are three main types of printers? Dot matrix, inkjet and laser.
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