研究结果支持难度观，不支持多重系统理论。
These results supported "difficulty theory" but not multiple systems theory.
总之，多重系统本身应该能自动照顾自己的头寸规模。
In summary, the systems themselves should take care of most of the position sizing automatically.
本文研究了多重系统同时稳定或极点配置的控制器设计问题。
The problem of designing a controller to obtain simultaneous stabilization or pole-assignment for multiple systems is dealt with in this paper.
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