本文主要研究了
This article mainly studies
以上为机器翻译结果，长、整句建议使用 人工翻译 。
本文主要研究了非方常数的一些理论。
The theories of nonsquare constants are mainly studied in this paper.
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本文主要研究了能量回馈系统。
Energy feedback system was researched in this paper.
本文主要研究了推力轴承的非线性动特性和瞬态性能。
In this paPer, nonlinear dynamic characteristic and transient performance of thrust bearings are studied.
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