The gas , which is sulphur-free , contains 89-99 % methane, up to 6 % ethane, and 3 % propane.

  • 天然气不含硫, 含甲烷88-99%, 乙烷6%和丙烷3%.

  • 词典精选例句 2025-01-19 11:04:38

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