The self designed equipment for toothless cutting of copper tube is described schematically.
该文以提高铜管切口质量为目的,通过对不同的无齿切割方式的分析,了解其切割原理,并将自行设计的无齿切割设备作了粗略描述。
The Research and Realization of Permanent Magnet Synchronous Motor Driver System in Gearless Low Middle Elevator;
永磁同步电动机驱动系统在无齿轮传动中、低速电梯的研究与实现
This study on the Anodonta of Dianchi Lake,shows that the following species--An-odonta woodiana woodlana (Lea), A.
滇池为云贵高原最大的淡水湖,湖中软体动物及介形类等水生生物非常丰富,尤其是软体动物的无齿蚌(Anodonta)更为丰富,种类多,个体数量大。
The Taxonomic Status of Some Species of Anodonta (Unionidae) and Hyriopsis (Unionidae) Based on Morphology and Molecular Phologeny;
基于形态学和分子生物学资料探讨蚌科无齿蚌属（Anodonta）和帆蚌属（Hyriopsis）种的分类地位