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击实功一定的条件下，随土中粗粒含量的增多，土的最佳含水率ω0和最大干密ρmax的变化趋势一般为（）。

A.ω0↑,ρmax↑
B.ω0↓,ρmax↑
C.ω0↑,ρmax↓
D.ω0↓,ρmax↓
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