其他建议的来源尚未经实验测试，但仅有的两个公布的生食纯素者B12水平的研究均显示B12水平的不足。
Other proposed sources have not been tested so directly, but the only two published studies of B12 levels in raw food vegans both showed inadequate B12 levels.
本文就此针对纯煤尘和煤尘-甲烷混合物的爆炸特性进行了实验研究。
The explosion characteristics of pure coal dust and coal-methane mixtures were studied experimentally in this paper.
本文通过加筋砂土和纯砂的三轴对比实验结果，研究了加筋砂土的抗剪强度特性。
This paper studies the shearing strength characteristics of reinforced sandy soils from the results of triaxial comparative testings of reinforced sandy soils with pure sands.
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