... 上扣大钳 make-up tong; make-utong 卸扣大钳 break-out tong 卸螺纹大钳 break out tongs ...
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The make-up tong is placed on the top tool joint and the break-out tong is placed on the bottom tool joint.
外钳打在上边的接头上，内钳打在下边的接头上。
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