3水流速變慢而將砂石沉積下來
(A)ㄅ侵蝕
(B)ㄆ搬運
(C)ㄇ堆積
(A)ㄅ侵蝕
(B)ㄆ搬運
(C)ㄇ堆積
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統計: A(0), B(0), C(7), D(0), E(0) #2511101
統計: A(0), B(0), C(7), D(0), E(0) #2511101