This Paper gives and proves the dual module of a projective module over aright hereditary and right perfect ring is stil projective.

本文给出并证明了右遗传、右完备环上投射模的对偶模仍然是投射模。

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By detailed analysis of systematic failure in the Intelligent Gateway, we propose a fault tolerant design scheme of dual module hot spare, and make it into use.

在对智能网关面临的系统级失效问题进行深入分析的基础上，提出并实现了智能网关的双机容错热备份系统设计方案。

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Based on the on-site practical situation, security index and usability index of the dual module hot spare (DMHS) computer interlocking control system are studied.

从现场的实际情况出发，笔者研究了双机热备计算机联锁控制系统的安全度和可用度指标。

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The almost zodiac-like craft has been an ongoing project over recent years, and contains a fully automated system which the Navy calls a "Precision Engagement Module" which uses an Mk-49 mounting with a dual missile launcher manufactured by Rafael.

ENGADGET: US Navy tests first 11-meter missile-firing sea drone (video)