In the course of transportation and application, gas chromatographs are sometimes damaged due to impact or falling.

在气相色谱仪的运输和使用过程中，由于受到冲击或跌落，仪器破损现象时有发生。

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This paper expounds the application of inverse thought in a mathematics required course teaching, and illustrates with example the good results due to the application of this method.

本文阐述逆向思维方法在数学教学中的运用，并举例说明运用这种方法进行教学所取得的较好效果。

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This paper expounds the application of inverse thought in a mathematics required course teaching, and illustrates with example the good results due to the application of this method.

本文阐述逆向思维方法在数学教学中的运用，并举例说明运用这种方法进行教学所取得的较好效果。

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