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【单选题】
碳化硅（SIC）的一种晶体具有类似金刚石的结构，其中碳原子和硅原子的位置是交替的。在下列三种晶体①金刚石、②晶体硅、③碳化硅中，它们的熔点从高到低的顺序是（ ）。
A.
①③②
B.
②③①
C.
③①②
D.
②①③
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