(1)一级测量标准(primary measurement standard)或 一级标准 ( primary standard )：被指 定或被广泛承认具有最高的计量学特性、其值不用参考相同量的其他标准而被承认的标准。
基于220个网页-相关网页
...知道你不好受、但是我是真的很在乎你 » I know you're not so good, but I really care about you 一级标准 » A-level standard 回忆在时间中沉淀 » Recalled the time in the precipitation ..
基于1个网页-相关网页
一级标准物质 Primary Reference Material ; GBW ; primary standard substance
一级标准气压表 absolute standard barometer
多布森一级标准 Dobson primary standard
一级标准气压计 primary standard barometer
一级标准硬度块 grade I standard hardness block
一级标准日射强度计 primary standard pyrheliometer
一级刻度标准 primary calibration standard
一级频率标准 primary frequency standard
The content of nitrate nitrogen in irrigating water has reached drinking water primary standard (NO_3~--N＜10mg/L) no matter in high water period and low water period in rural area. The numerical value is lower than 2mg/L,which is belonged to good state.
远郊区灌溉水中的硝态氮无论是在丰水期还是枯水期都达到了国家饮用水一级标准(NO_3~-V＜10mg/L),并且都低于2mg/L,属于优良状态。
参考来源 - 黔中黄壤菜地土壤氮素变异特征及环境效应研究·2,447,543篇论文数据，部分数据来源于NoteExpress
产品质量达到国家一级标准。
粗蛋白、粗纤维含量均符合国际一级标准，品质较好。
Crude protein content, crude fiber content were agreement with or higher than international first grade dry grass product standard.
对于某些研究工作和仲裁工作，可以从美国标准局获得经过分析的一级标准物。
For some research purposes and possibly for referee work, analyzed primary standards may be obtained from the U. s. Bureau of standards.
应用推荐