但是传统的PID控制器用于磁力轴承的控制时，超调大，参数整定困难，抗扰能力差，难以取得满意的控制效果。

The AMB using PID controller have big overshoot, weak disturbance rejection ability and difficult adjustment of parameters, so it is not satisfied.

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本文利用布尔差分的性质，给出了一种不同于传统的求组合逻辑线路故障测试码的新方法，对故障测试有一定的简化作用。

The properties of Boolean difference are made use of to derive a new method for fault testing in combinational logic circuits. This method is simpler and different from the traditional one.

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