下面关于SiO2晶体网状结构的叙述正确的是 A.存在四面体结构单元,

下面关于SiO2晶体网状结构的叙述正确的是

A.存在四面体结构单元,O处于中心,Si处于4个顶角

B.最小的环上,有3个Si原子和3个O原子

C.最小的环上,Si和O原子数之比为1:2

D.最小的环上,有6个Si原子和6个O原子

答案

D

相关题目

2010年温哥华冬奥会所用冰壶重190N,底面积0.04m2,静止在冰面
2010年温哥华冬奥会所用冰壶重190N,底面积0.04m2,静止在冰面上对冰面的压强为   Pa.如图为中国运动员推出冰壶的镜头,冰壶被推出后仍向前滑行是
如图,将质量为m的滑块放在倾角为θ的固定斜面上。滑块与
如图,将质量为m的滑块放在倾角为θ的固定斜面上。滑块与斜面之间的动摩擦因数为μ。若滑块与斜面之间的最大静摩擦力和滑动摩擦力大小相等,重力
Although the women’s rights movement in the United States in thought of as a r
Although the women’s rights movement in the United States in thought of as a recent development,its beinnings date back over one hundred and seventy years.At that time women were dependents in the e
阅读材料,回答下列问题。(20分) 材料一 总统强烈要求国
阅读材料,回答下列问题。(20分) 材料一 总统强烈要求国会特别会议废除中立法中禁运条款(1939年9月21日)从纯粹的物质的观点看,在我们这里加工
Children mustn't play _____ the street. A. to  B. On    C. for    D. in
Children mustn't play _____ the street. A. to  B. On    C. for    D. in
After the accident, she had some difficulties _______ recalling what had happene
After the accident, she had some difficulties _______ recalling what had happened _______ her. A. on; to             B. on; on                   C. in; to         
爱美之心远古就有之,下列我国远古人类当中,懂得爱美的
爱美之心远古就有之,下列我国远古人类当中,懂得爱美的人是(   ) A. 北京人        B.山顶洞人         C. 元煤人         D.蓝田人
My brother keeps________my work.        A.    to help     B.  
My brother keeps________my work.        A.    to help     B.    help C.    helping    D.    helped

最新题目