The crystallographic problems of two-dimensional crystal, such as the matrix expression, the symmetry and the systematic absence law of the crystal's X-ray diffraction, are studied.

对二维晶体的矩阵表示、对称性及其对X射线衍射的系统消光规律进行了研究，得到并证明了二维晶体的矩阵表示的二个定理和二维晶体对X射线衍射的系统消光定理。

youdao

The Global Plan includes a large budget for ACSM but, in the absence of systematic guidance in 2006 (to be published in 2007), NTP budgets were typically small and activities uneven.

全球计划列入一个用于宣传、交流和社会动员的大额预算，但是在2006年缺乏系统指导(将于2007年发表)的情况下，国家结核控制规划预算通常是小的，并且活动不平衡。

youdao

In the absence of systematic upsetting instructions, we would waste quite a few materials as well as a great deal of time for model experimenting.

如果缺少系统的局部镦粗规则的指导，则会造成大量的试模时间和材料的浪费。

youdao

Incredibly, it bears all the hallmarks of subprime with respect to a lack of transparency, a systematic failure to disclose and an utter absence of due diligence, good governance and accountability.

CENTERFORSECURITYPOLICY: Into the fire