We describe the properties of the almost split sequence containing projective module as the first term and the middle term.

本文刻划了包含投射模的几乎可裂序列，给出以投射模为首项和中间项的几乎可裂序列的特性。

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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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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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