USB (Universal Serial Bus) possesses good characteristics such as fast transmission, high reliability and flexibility. It has been widely used in the PC peripheral devices and potable system.
USB(通用串行总线)具有传输速度快、可靠性高、使用灵活等优点，作为一种通信接口规范，他被广泛地应用在PC外设和便携式系统中。
Watts Series ET non-potable water expansion tanks may be installed in a tee or any other suitable tapping in the heating system and can be installed in a vertical or horizontal position.
美国瓦茨系列et非饮用水膨胀罐可以安装在一个T形管或供暖系统上任何其他适合的连接端口上，可以垂直安装或水平安装。
Series 709 Double Check Valve Assemblies are designed to prevent the reverse flow of polluted water from entering into the potable water system.
系列709双止回阀总成适用于防止受到污染的水回流进入到饮用水系统中。
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