In micrographics, a measure of the remoteness of the copy from the original material, the first microfilm representation being the first generation microfilm.
在缩微照相技术中，度量副本离原始资料远近的程度。第一次缩微
的胶片为第一代缩微胶片。
In micrographics, a measure of the remoteness of the copy from the original material, the first microfilm representation being the first generation microfilm.
在缩微照相技术中，度量副本离原始资料远近的程度。第一次缩微的胶片为第一代缩微胶片。
Compared with virginoparae, the genetic relationship between fundatrix and the first generation of virginoparae (apterous) produced by fundatrix (apterous) was much close.
③干母和干雌的遗传关系很近,但孤雌蚜已与二者有分化.
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