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用于地质、石油、天然气钻完井和修井作业中拧紧或卸开钻柱、套管、油管和井下工具等连接螺纹的井口工具。
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Flowers in the Evil Sea
Flowers in the Mirror
flower snark
Flowers Over Water
Flowers upon a River by Zhu Da
flower tune
flower twig pattern
flower vegetation
Flower Wall Rendezvous
flowery language can only beat around the bush
flowery language undermines the principle
flow field
flow field detection
flow field detector
flow field fitting method
flow field in the fishway
flow field plate
flow-field structure in magnetosphere
flow field visualized measurement
flow-focusing channel
flow function
flow gauge
flow graph
flow-in
flow in a network
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