A.≥0.5%CH4,≥0.5%CH4,<0.5%CH4B.≥1.5%CH4,≥1.5%CH4,<1.5%CH4C.≥1.0%CH4,≥1.0%CH4,<1.0%CH4D.≥1.5%CH4,≥2.0%CH4,<1.5%CH4
A.≥1.0%CH4,≥1.5%CH4,<1.0%CHB.≥1.5%CH4,≥1.5%CH。,<1.5%CH。C.≥2.5%CH。,≥2.5%CH。,<2.5%CH。D.≥1.5%CH。,≥2.0%CH4,<1.5%CH4
A、先泄压再退料B、先退料再泄压C、边退料边泄压