试题与答案

用数字和符号填空: (1)两个氮气分子。 (2)氢氧根离子。 (3)标出氧化镁中

题型:填空题

题目:

用数字和符号填空:

(1)两个氮气分子         。  

(2)氢氧根离子         。 

(3)标出氧化镁中镁元素的化合价         

答案:

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参考答案:起重机械设备;起重工具

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在下面对话的空白处填入适当的话语,(话语可以是句子,短语与词),使对话完整。

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B: Oh…my clothes 小题2:______________________________. I don’t look cool.

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A: Huh. Maybe you could小题3:___________________________ in the evenings.

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B: Yes, you’re right. Thank you very much.

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