单项选择题
A.200kPaB.140kPaC.160kPaD.100kPa
A.锈蚀B.污物C.油漆D.清洁
A.120kPaB.140kPaC.160kPaD.180kPa
A.50kPaB.20kPaC.80kPaD.5kPa
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