本文研究了子空间框架的一个基本恒等式。

In this paper, a fundamental identity for frames of subspaces is introduced.

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利用基本三角恒等式、物理学中几何光学知识和几何画板软件等三种思维方法，来探讨一个最短时间问题的解法。

The author explores the solution to the best time problem according to three ways of thinking, including basic trigonometric identity, geometrical optics of physics and Geometer's Sketchpad.

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会计基础知识（会计恒等式与账户、交易记录、分类账与日记账、基本会计报表、工作底稿的编制与使用等）；

After the adjustments are journalized and posted, a useful step in preparing the financial statements is to list the accounts, along with their adjusted balances, on an adjusted trial balance.

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会计基础知识（会计恒等式与账户、交易记录、分类账与日记账、基本会计报表、工作底稿的编制与使用等）；

After the adjustments are journalized and posted, a useful step in preparing the financial statements is to list the accounts, along with their adjusted balances, on an adjusted trial balance.

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