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【单选题】
标准贯入试验时，使用的穿心重和落距分别是（）A.
锤重为 10Kg, 落距为 50cm
B.
锤重为 63.5Kg, 落距为 76cm
C.
锤重为 63.5Kg, 落距为 50cm
D.
锤重为 10Kg, 落距为 76cm
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