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。
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。
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。
However, the lack of a full understanding of city nodes 'functions and values leads to the absence of a systematic theoretic research on it from multiple angles.
但目前由于对结点所具有的功能与价值等存在理解和认识上的不足，致使学界对它缺乏系统和多角度的深入研究，由此影响到整个城市环境的和谐建设。
The research has found that the board of directors basically accommodates the requirements of scale and structure, but it's in the absence of a systematic specific construction.
分析中发现董事会在规模、结构上基本符合要求，但在具体设置上仍不科学；
The research has found that the board of directors basically accommodates the requirements of scale and structure, but it's in the absence of a systematic specific construction.
分析中发现董事会在规模、结构上基本符合要求，但在具体设置上仍不科学；
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