(6分)、下列五种物质中,①Ar ② ③ ④NaOH ⑤ ,只存在共价键的是 ,只存在离子键的是 ,既存在离子键又存在共价键的是 ,不存在化学键的是 。属于共价化合物的是 属于离子化合物的是 。(填序号)
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