Therefore, the critical grade to achieve a balance between mining and filling is a significant indicator to evaluate whether the system is perfect.

因此，采充平衡临界品位是评价该系统是否完美的重要指标之一。

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An accelerator driven sub critical fast reactor (ADSFR) was used to study the Pu burning of weapons grade.

选取加速器驱动次临界快堆(ADSFR)进行燃烧武器级钚研究。

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Calculation for short columns using Grade Q235 steel tube filled with Grade C30 concrete indicates that the critical diameter to thickness ratio of steel tubes is about 1700.

对Q235钢材、C30混凝土短柱构件的计算结果表明，钢管的最小临界径厚比为1700左右。

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The curriculum outline activities that address learning skills in each learning grade level, including letter writing, data collection, reading, research skills and presentation skills, critical thinking and collaborative working in small groups.

教程总体活动注重,培养学生在每个年级水平的,学习技巧，包括书信写作，数据搜集，阅读，研究技巧，展示技巧，批判性思维,还有小组的团队协作能力。

麻省理工公开课 - 媒体、教育、市场课程节选

In time of war, even the more conservative estimates of such losses would be absolutely devastating - particularly if, as seems likely, they come disproportionately from the critical ranks of field grade and non-commissioned officers.

CENTERFORSECURITYPOLICY: The 'Bring Back the Draft' Act

Apparently, all of the above were considered military-grade, mission-critical methods of communication 100 years ago.

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The group argues the issue is particularly acute because of the critical importance of achieving a C grade in GCSE English for future educational and professional opportunities.

BBC: Education & Family