【extension_tubes】什么意思_英语extension_tubes的翻译_音标_读音_用法_例句_在线翻译

extension tubes

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abstract: A set of extension tubes with a pen illustrating the lack of internal lenses

以上来源于: WordNet

1.
N a spacer element that can be fixed between the camera body and the lens to increase the distance between film and lens and allow closer focus than would be possible without it 近摄接圈 [photog]

The results reveal that the grain size of welding seam decreases with the increase of welding velocity and the rate of tubes' extension increases under the same technological conditions.

经对试验结果分析表明：在其它工艺参数不变的情况下，随着焊接速度的增加，焊缝组织的晶粒度减小。铜管的扩口率增加。

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