《煤矿安全规程》规定，采掘工作面进风流中CO2不得超过0.5%，矿井总回风巷或一翼回风流中不得超过0.75%。（)

A.1.5%

B.1%

C.0.75%

A.0．5％

B. 0．75％

C. 1％

D.1．5％

A.1%

B.0.75%

C.0.5%

D.1.5%

A.0.5%

B.0.75%

C.1%

A.0.75%

B.1.0%

C.0.5%

D.1.5%

A.1.0

B.2.0

C.1.2

D.0.5

A.1%

B.1.5%

C.2%