求翻译：选用：主要考虑使用工况和操作要求球阀的品种和规格很多，应按使用工况（如工作介质，操作压力，操作温度，管路通径等）以及安装操作要求（如连接方式、驱动方式等）来选用适当的球阀。是什么意思？

Optional: mainly consider the use of conditions and operating requirements of many varieties and specifications of the ball valve in accordance with conditions (such as the working medium, operating pressure, operating temperature, pipe diameter, etc.) and installation of the operating requirements

Use: Primary use performance and operation requirements ball valve in the variety and size a lot, and should be used as performance (such as the media, operating pressure, temperature and line diameter, and so on) as well as installation of the operating requirements (such as connectivity, drive mod

Selection: The main consideration use operating mode and the operation requests the ball valve the variety and the specification are very many, should according to the use operating mode (for example actuating medium, service pressure, operating temperature, pipeline latus rectum and so on) as well

Use: mainly considering use and requires many varieties and specifications of ball valves, should be using condition (such as working media, operating pressure, operating temperature, pipe sizes, and so on), and installation requirements (such as connection mode, drive mode, and so on) to use the ap

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