用规范法计算地基最终沉降量时，当无相邻荷载影响时，压缩层厚度Zn确定的根据是（）。

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【单选题】【消耗次数：1】

① σz /σcz≤0.1

② σz /σcz≤0.2

③ △Sn≤0.025Σ△Si

④ Zn=b(2.5-0.4lnb)

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