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【单选题】
下列叙述不正确的是 [ ]A.
含有非极性键的分子不极性分子
B.
完全由极性键形成的分子不一定是极性分子
C.
由共价键结合而成的化合物，其晶体类型为原子晶体
D.
如果晶体中既含有离子键，又有共价键，这样的晶体属于离子晶体
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A.
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B.
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C.
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