此次，系统测试应用程序还是基本且较简单的，然而，为了找到缺陷，能够在特定压力级别和持续时间内运行。
During this time, the system test application was also basic and simpler; however, it was able to be run under a certain level of stress and duration in order to find defects.
行李包装托运行李必须包装完善、锁扣完好、捆扎牢固、并能承受一定压力。
Baggage packing The checked baggage should be packed correctly, well locked and tied up and be able to withstand reasonable handing.
区域供热系统中的稳压(或定压)系统，是保证供热网合理运行的重要手段。
It is very important for the operating of district heating systems to use the pressure limiting device.
采用DWH变频给水设备，实现了锅炉恒压给水，使水泵可在一定压力下连续运行，满足了锅炉用水需要。
The paper introduces the application of DWH frequency conversion water supply equipment in steam boiler.
采用DWH变频给水设备，实现了锅炉恒压给水，使水泵可在一定压力下连续运行，满足了锅炉用水需要。
The paper introduces the application of DWH frequency conversion water supply equipment in steam boiler.
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