某微粒结构示意图为 该微粒的符号是 ,(此空得分率不高) 它有  个电子层,最外层电子数为 。

某微粒结构示意图为 该微粒的符号是 ,(此空得分率不高) 它有  个电子层,最外层电子数为 。

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制造下列物品需用热固性塑料的是

制造下列物品需用热固性塑料的是

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We are having a picnic, _____ it starts to rain. ( )

We are having a picnic, _____ it starts to rain. ( )

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下列有关水的描述中不正确的是

下列有关水的描述中不正确的是

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I’d like ________ the film with my friend. I should buy two ________ tickets (票)

I’d like ________ the film with my friend. I should buy two ________ tickets (票). ( )

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