When construction began in 1969, Metsamor was a VVER 440, Model 230, an example of one of the earliest pressurized-water nuclear plant designs, developed by the Soviets between 1956 and 1970.
当1969年开始建设时，Metsamor用的是VVER440型230反应堆，最早的压水堆核电站的设计样板之一，是由苏联在1956年- 1970年间开发的。
In a construction of water source well in Zhangzi County, Shanxi, we used available 7/9 air compressor and TB850/50 slurry pump, and foam pressurized drilling technique.
在山西长子县某水源井施工中，利用现有7/9压风机与TB850/50泥浆泵设备，采用泡沫增压钻进技术进行钻探。
Based on application practice, the destroy cause of the "o" shape pressurized ring is analyzed, by which the counter measure for improvements are put forward for reference of design and construction.
本文通过“O”型密封圈在工程中的应用总结，分析了“O”型密圈通常破坏的原因，并针对破坏原因提出了合理的改进措施，供设计及施工参考。
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