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【单选题】
波长为λ的X射线，投射到晶格常数为d的晶体上，取k=1，2，3，…，出现X射线衍射加强的衍射角θ(衍射的x射线与晶面的夹角)满足的公式为______。A.
2dsinθ=kλ
B.
dsinθ=kλ
C.
2dcosθ=kλ
D.
dcosθ=kλ
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