A.≥1.0%CH4;≥1.0%CH4;<1.0%CH4
B.≥1.5%CH4;≥1.5%CH4;<1.0%CH4
C.≥1.0%CH4;≥1.5%CH4;<1.0%CH4
D.≥1.5%CH4;≥1.0%CH4;<1.0%CH4