(9分) (1)按下列要求选择序号填空。 A．CH4 B．2Fe3+ C．CO32-_爱下问搜题

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问题填空题

(9分) (1)按下列要求选择序号填空。

A． CH₄B．2Fe³⁺C．CO₃^2- D．3O₃ E．OH^- F．C₂H₅OH G．3O₂ H． 2Fe²⁺

①两个亚铁离子____________ ； ②天然气的主要成分__________ ；

③纯碱中的阴离子__________ ； ④ 3个氧分子____ _________。

⑵下图是某粒子的结构示意图。

①若该粒子为阳离子时，则m - 2____ x（选填“＞”“＜”或“=”）；

②若该粒子为原子，且m = 3x时，则该元素属于____ 元素（填“金属” 或“非金属”）；

（3）钢铁制品在中易生锈；请写出一种防止铁生锈的方法，由于不同，使得钢和生铁的坚韧性有较大差异。

答案

⑴①H ② A ③ C ④ G ⑵① ＞ ② 金属 ⑶潮湿的空气中；涂油等（答案合理同样给分）；含碳量不同

题目分析：(1)①两个亚铁离子应为2Fe2，应选H项。②天然气的主要成分为甲烷，应选A项。③纯碱为碳酸钠，其中的阴离子为碳酸根离子，应选C项。④ 3个氧分子应为3O₂，应选G项。

⑵①若该粒子为阳离子时，则该粒子为失电子形成的，所以m - 2 ＜x；

②若该粒子为原子，则m = 2+x；且m = 3x时，可解得m为1。所以该元素为锂元素，属于金属元素。

（3）钢铁制品在潮湿的空气中中易生锈；防止铁生锈的方法防止铁制品生锈的措施：①保持铁制品表面的清洁、干燥；②表面涂保护膜：如涂油、刷漆、电镀、烤蓝等；③制成不锈钢，

钢和生铁的性质差异是因为它们的含碳量不同。

多项选择题

通过以下哪些检查来判断意识障碍的程度（）

A.语言反应

B.肢体活动

C.瞳孔对光反应

D.角膜反射

E.吞咽反射

完形填空

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A．qualifications

B．occupations

A．comfortable

B．administration