中国大学MOOC: 形成水合物的条件Conditions for hydrate formation：（）
一定的温度与压力A certain temperature and pressure 气体处于脉动、紊流等激烈扰动之中，并有结晶中心存在。Gas is in the pulsation, turbulence and other violent disturbances, and there is a crystallization center 天然气中含有足够的水分Natural gas contains enough moisture
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中国大学MOOC: Felicity conditions include general conditions, propositional content condition, preparatory conditions, ____________, and essential condition.
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中国大学MOOC: 天然气水合物赋存的地区（ ）。
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Which of the following conditions may contribute to the formation of deposits on the blades of the turbocharger turbine?（）
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中国大学MOOC: The conditions of the liability for the breach of contract include
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中国大学MOOC: Small __________ electrons are, they play an important role in the formation of electric current.