The main objectives lie in reduction of size and weight of wires and cables and increase in their flexibility, hot water resistance and heat resistance.

其主要目的在于减小线缆的尺寸和重量，增加了线缆的柔软性、耐热水性和耐热性等机械物理性能。

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Therefore, often feet with hot water, can enhance the body immunity and resistance, with physical fitness, prolong life.

因此，经常用热水洗脚，能增强机体免疫力和抵抗力，具有强身健体、延年益寿的功效。

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The balance valve which is one of governing valves can conveniently change flow resistance of hot water, improve the regulating ability and keep the safety of heating system.

根据平衡阀的工作特点，使用它能合理地改变供暖系统的流动阻力，改善供暖系统的调节功能，保证了供暖系统工作的稳定性。

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