单项选择题
A.2B.4C.6D.8
A.M2X>M1X>M3YB.M1X>M3Y>M2XC.M2X>M3Y>M1XD.M3Y>M2X>M1X
A.全部四面体空隙B.全部八面体空隙C.1/2四面体空隙D.1/2八面体空隙
A.4B.6C.8D.12
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