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【单选题】
下列说法中，正确的是A.
离子化合物中一定不含共价键，共价化合物中一定不含离子键
B.
水分子呈直线形，氨分子呈三角锥形
C.
碳原子之间可形成碳碳单键、碳碳双键或碳碳叁键
D.
分子间作用力越大，分子的热稳定性就越大
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皮皮学刷刷变学霸
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