A. 正确 B. 错误
A. 对 B. 错
A. ≥0.5%CH4,≥0.5%CH4,<0.5%ch4 B. ≥1.0%CH4,≥1.5%CH4,<1.0%ch4 C. ≥1.5%CH4,≥1.5%CH4,<1.5%ch4 D. ≥1.5%CH4,≥2.0%CH4,<1.5%ch4