A、≥0.5%CH4,≥0.5%CH4,<0.5%CH4

B、≥1.5%CH4,≥1.5%CH4,<1.5%CH4

C、≥1.0%CH4,≥1.0%CH4,<1.0%CH4

D、≥1.5%CH4,≥2.0%CH4,<1.5%CH4

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