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酶毒素主要污染( )
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皮皮学刷刷变学霸
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【单选题】研究发现，长江干流江苏段河床在1985年前后平均冲淤状态发生了明显的转变．由淤积转变为冲刷。其主要原因是（ ）。
A.
该河段平均流速下降
B.
该河段径流量减少
C.
流域年降水量减少
D.
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