主要讨论了一类扰动系统的指数稳定性问题 。
The study of an exponentially stable character of perturbed system at the point of equilibrium;
突出的高粘度指数，使用中卓越的粘度稳定性。
Very high viscosity index and excellent viscosity stability in operation.
突出的高粘度指数，使用中卓越的粘度稳定性。
Very high viscosity index and excellent viscosity stability in operation.
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