The illustrative example shows that this method is effective to check the quadratic stability of discrete-time interval 2-D systems.
所给出的数值算例表明该判定条件可以有效地判定离散区间2-D系统是否二次稳定。
There is no fixed time interval before marriage that the premarital check-up has to be performed.
至于在婚前多久才须要做婚前检查，并无特定限制。
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