Valve and strainers must be supported with conventional piping system support devices.
阀门和过滤器必须采用常规的管道系统支撑装置加以支撑.
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Modem tourism economy needs environmental system support, and a good environment is precondition for sustainable development.
摘要现代旅游经济的发展依赖于环境系统的支撑, 有良好的环境作为保障才可能实现可持续发展.
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