单项选择题
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
A.0.18~0.28MPaB.0.15～0.4MPaC.0.2～0.3MPaD.0.3~0.4MPa
A.0.3~0.5MPaB.0.15～0.4MPaC.0.2～0.3MPaD.0.3~0.4MPa
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