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"
htxt=htxt+"";
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htxt=htxt+" □ 13、下面关于SiO2晶体网状结构的叙述正确的是( )A、最小的环上,有3个Si原子和3个O原子B、最小的环上,Si和O原子数之比为1﹕2C、最小的环上,有6个Si原子和6个O原子D、存在四面体结构单元,O处于中心,Si处于4个顶角该题未给出正确答案 | ";
htxt=htxt+"LYX640429 <6-10 9:28> | ";
htxt=htxt+"
";
htxt=htxt+"";
htxt=htxt+"";
htxt=htxt+" □ 还不错 | ";
htxt=htxt+"wangjx1976 <6-9 14:4> | ";
htxt=htxt+"
";
htxt=htxt+"";
htxt=htxt+"";
htxt=htxt+" □ 及时 详细 | ";
htxt=htxt+"a3201 <6-9 8:27> | ";
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