Based on MHD ballooning mode stability theory, marginal stability regions of the plasma ballooning mode in negative magnetic shear configuration are calculated in this paper.

根据MHD气球模稳定性理论，计算了负磁剪切位形中等离子体气球边缘稳定性区域。

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And in co-ordination with maths methods, we will introduce the relative theory in management, such as marginal balance, the flexibility in enterprise management, and the idea of stability, etc.

同时，结合数学方法我们介绍了有关的经营管理原理，如边际平衡原理，企业经营的灵活性、稳定性等概念。

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Results the marginal fitness, color stability and strength of crowns, and gingival health were satisfactory in the 25 patients.

结果25例全瓷冠桥修复体色泽自然，无裂纹和脱落，边缘密合，牙周健康。

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