Based on the principle of new barrel theory, this paper probed into the digital library, strengthen the network security protection measures.

文章根据新木桶理论的原理，探讨了加强数字图书馆网络安全防护的措施。

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The working principle and energy conservation of pin, screw and temperature control equipment in pin barrel cold feed extruder were described.

介绍了销钉机筒冷喂料挤出机中销钉、螺杆及其新型温控装置的工作原理，论述了上述元件节能的理论依据。

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This paper introduces the principle of double barrel drum mix plant and the application in producing the asphalt mixture, aiming at the rounding town project of Foshan.

阐述了双滚筒连续式拌和楼的工作原理，并以佛山一环城际快速路为工程依托，介绍其在沥青混合料生产中的应用。

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