单项选择题
A.0.5 Mpa B.0.3 Mpa C.0.05 Mpa D.0.03 Mpa
A.0.03Mpa/0.079Mpa B.0.02Mpa/0.588Mpa C.0.05Mpa/1.47Mpa
A.小于50mg/L B.小于30mg/L C.小于20mg/L D.小于10mg/L
A.0.02Mpa B.0.2Mpa C.0.3Mpa D.0.5Mpa
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