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如图2-1A-2c所示的不连续变量，主要是在“通-断”控制或者“砰-砰”控制出现，将后续章节单独处理。
Discontinuous variables such as shown in Fig. 2-1A-2c occur in "on-off" or "bang-bang" control system and are treated separately in a subsequent paper.
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