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SSCSSV(subsurface controlled subsurface safety valve)

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[新英汉石油技术词典]

SSCSSV(subsurface controlled subsurface safety valve)
井下控制井下安全阀

是什么意思，SSCSSV(subsurface controlled subsurface safety valve)的解释，SSCSSV(subsurface controlled subsurface safety valve)的翻译