根据《堤防工程施工规范》（SL260-98）规定，对于分段填筑的铺料作业，各段应设立标志，以防漏压、欠压和过压。上下层的分段接缝位置应()。

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【单选题】【消耗次数：1】

① A错开

② B对齐

③ C平行

④ D垂直

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