... sliding speed door 快速滑动门,旁开单扇门 sliding type safety 滑动型安全钳 slim-line lamp 线型灯,扶手照明 ...
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To overcome the shortcomings of the shear pin type joint and left-hand thread type joint, a sliding sleeve subsurface safety joint is developed.
为了克服剪钉式和反扣式两种安全接头的不足,研制出一种滑套式井下安全接头。
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