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【单选题】
已知某基础埋深1.2m,第一层厚度0.5m,重度17KN/m3,第二层厚度3.5m,重度为18KN/m3,不计地下水影响,试求基础埋置深度范围内的平均重度为()KN/m3。A.
17.6
B.
17.9
C.
18.2
D.
16.5
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