不动管环缝焊接机是涉及大型管件环缝焊接机的改进。
The invention discloses a circular seam welding machine for fixed pipes, which relates to the improvement on circular seam welding machines for large pipes.
结果表明扶手型碳纳米管环的能谱结构与环的直径有关。
The results show that ATCNTs' energy band structure is relation to torus diameter.
该APC40有16个旋钮，由每个发光二极管环包围。
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