单项选择题
A.50 B.80 C.100 D.150
A.40~60mm B.60~80mm C.80~100mm D.30~40mm
A.1.5 B.2.0 C.2.5 D.3.0
A.Ⅰ类桩 B.Ⅱ类桩 C.Ⅲ类桩 D.Ⅳ类桩
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