An exception is the function ST_Distance, which must be used in a less-than comparison with an arbitrary distance.

一个例外是ST_Distance函数，它必须出现在针对一个任意距离的小于比较式中。

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By comparison with analogue AC servo system, some remarkable features of digital AC servo system, such op programming function, system stability and system performance are described.

通过与模拟交流伺服系统的比较，说明了全数字交流伺服系统可编程能力强、系统稳定性好、系统性能提高等特点。

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Utilizing piecewise continuous vector Lyapunov function, the practical stabilization of control systems with fixed moments of impulse effects by establishing a new comparison result is considered.

借助于向量李雅谱诺夫函数，通过建立一个新的比较结果，研究了具有固定时刻脉冲的控制系统的实际稳定性。

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