All of them can be used as secondary standard Rontgen meter and in protection dose measurement.
上述电离室可作次级标准伦琴计和防护剂量测量用。
From 2002 to 2004, the quality of ambient air in urban area of Qinzhou city reach national secondary standard.
2002年至2004年，钦州市区环境空气质量达国家二级标准。
Through its uniformity and stability monitoring, the results showed that the substances meet the secondary standard specifications.
通过对均匀性和稳定性的监测，符合二级标准物质的规范要求。
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