The director of this museum can be said to have learned mechanics very well.

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When a rotary drilling rig is used to drill and pile, why is the hole filled with mud?

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As long as you use the right method, work won't be that tiring.

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What modifications can be made to an excavator? #PopularScience #Unzip #LargeMachinery #Excavator

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Introduction to Traditional Group Farming Culture in Africa

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Why do we cut trees at height? Will there be accidents? #高空伐木 #解压 #科普

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Why is steel colored after cutting? #Science #Unzip #Metalworking #CoolKnowledge

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Why can loose sand be made into sand sculptures after mixing with water?

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Yemen is the first country to be destroyed by drugs, even children are not spared. How tragic is it?

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Why not use a high-pressure water gun to wash your car? #Science #Unzip #High-pressureWaterGun #CarW

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Why are the joints of steel cables so strong? #Science #Unzip #SteelCable #MachineryManufacturing #E

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Why does steel slag when forging iron? #Science #Unzip #Forging #ExtremeComfort

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