单项选择题
A.大于0.2Mpa B.大于0.3Mpa C.大于0.1Mpa
A.0.1---0.15Mpa B.0.15---0.2Mpa C.0.2---0.3Mpa
A.0.2Mpa B.0.15Mpa C.0.1Mpa
A.50---150mm B.150---200mm C.30---50mm
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