单项选择题
A.0.17~0.20MpaB.0.18~0.22MpaC.0.17~0.22MpaD.0.18~0.20Mpa
A.＞30cbm/hB.＞40cbm/hC.＞50cbm/hD.＞60cbm/h
A.0.40-0.60MPaB.0.50-0.60MPaC.0.40-0.50MPaD.0.30-0.60MPa
A.≥0.15MpaB.≥0.25MpaC.≥0.35MpaD.≥0.45Mpa
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