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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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[Shen Ji Zhu Tan] Dragons, a mysterious species, willingly descended to the mortal realm and ultimat

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Where is the airplane's fuel tank? Given how expensive aviation fuel is, why do planes still dump fu

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How is pi calculated? Mathematicians have been calculating it since ancient times. Why is it so impo

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Why do cold water and hot water mix and become incompatible? Do you know the principle?

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What does the fourth type of carbon dioxide look like? Put dry ice into a pressure chamber and inter

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Why do shoelaces come loose even though they're tied tightly? Scientists spent two years figuring ou

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