本文介结了高空作业车液压卸荷和发动机熄火两种紧急停止电路的改进，讨论了电路的可靠性。

Improvement in emergent stop circuits for hydraulic relief and engine stoppage is introduced in the article, and reliability of the electric circuit is discussed.

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改进后的氢气净化器，故障少、可靠性高、电路工作范围宽，维修方便。

The improved cleaner is characterized by less failure, high reliability, wide operation range and the convenience of maintenance.

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为提高数字电路实验箱的利用率和可靠性，本文针对数字电路实验箱存在的问题，提出了电源和面板改进方法。

In order to increase the occupying coefficient and reliability of digital experiment boxes, we improve power supply and panel design. The design method and the circuit diagram are presented.

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