供热系统开口运行，安全系数高。
有些系统还需预留测量水温、水位、压力的开口。
Some systems also need to be reserved for measuring water temperature, water level, pressure openings.
怎样分析开口系统具有重要的理论意义和实用价值。
Analysing open systems are of great important both in theory and in practice.
怎样分析开口系统具有重要的理论意义和实用价值。
Analysing open systems are of great important both in theory and in practice.
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