This Paper gives and proves the dualmodule 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 dualmodule hot spare, and make it into use.
Based on the on-site practical situation, security index and usability index of the dualmodule hot spare (DMHS) computer interlocking control system are studied.