Warning: file_put_contents(/www/wwwroot/zidian/diubi.cn/cache/b912a9df7f24561c0613193a08a0b19d.txt): failed to open stream: No space left on device in /www/wwwroot/zidian/diubi.cn/index.php on line 59 boron carbide英英字典_boron carbide剑桥英语解释_boron carbide柯林斯英文解释_果味酸柯林斯词典
1. N a black extremely hard inert substance having a high capture cross section for thermal neutrons. It is used as an abrasive and refractory and in control rods in nuclear reactors. Formula: B4C 碳化硼