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【单选题】
化学键是相邻原子间强烈的相互作用，主要有离子键、共价键等。有关它们叙述正确的是A.
非金属元素组成的化合物中只含共价键
B.
不同元素的原子构成的分子只含极性共价键
C.
熔融状态下能够导电的化合物中存在离子键
D.
单质分子中均存在化学键
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