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天然气是一种清洁的燃料和重要的化工原料,是主要的一次能源之一。1987年,世界一次能源消费构成中天然气占19.9％,而在我国只有2.1％,和世
Natural gas is a clean fuel and an important chemical raw material and is one of the major primary sources of energy. In 1987, the world's primary energy consumption constituted 19.9% of natural gas while in China only 2.1% of the world