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单选题 If the final phase trajectory of a nonlinear system is a closed ring, then the state of this nonlinear system is( )
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时间：2026-05-10 13:29:34
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题目1单选题
If the final phase trajectory of a nonlinear system is a closed ring, then the state of this nonlinear system is( )A. StableB. UnstableC. Self-excited oscillationD. Critical stable
题目2单选题
The shape of the saturation characteristic input-output curve is ( )A. A straight lineB. Composed of linear and saturated segmentsC. Exponential curveD. Sine curve
题目3单选题
Compared with the phase trajectory of linear systems, the phase trajectory of nonlinear systems is( )A. More regular shapeB. Possible existence of limit cyclesC. A closed curveD. Without singular point
题目4单选题
If the final phase trajectory of a nonlinear system is a helix that converges to the origin, then the state of the nonlinear system is( )A. StableB. UnstableC. Self-excited oscillationD. Critical stable
题目5单选题
The input-output curve of relay characteristics is ( )A. Continuous and smoothB. Piecewise linearC. Having jumping discontinuity pointsD. Exponential curve
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