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【多选题】
冲积物的工程特性主要表现在（ ）。
A.
砾石成分复杂, 往往具叠瓦状排列。砂和粉砂的矿物成分中不稳定组分较多。
B.
碎屑物质的分选性较好。
C.
碎屑颗粒的磨圆度较高。
D.
冲积物往往具有二元结构，下部为河床沉积，为河上部漫滩沉积
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