单项选择题
A.60.3B.55.3C.50.3D.70.3
A.88.9B.75.9C.101.9D.80.9
A.30.19B.25.19C.32.19D.40.15
A.相等B.无可比性C.平式油管比外加厚油管小D.平式油管比外加厚油管大
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