Warning: file_put_contents(/www/wwwroot/ppbbu/cp667.com/cache/0cc5350c6488f05475423f3dbab20fd4.txt): failed to open stream: No space left on device in /www/wwwroot/ppbbu/cp667.com/index.php on line 55 quartz crystal英英字典_quartz crystal剑桥英语解释_quartz crystal柯林斯英文解释_淳朴汉英词典
1. N a thin plate or rod cut in certain directions from a piece of piezoelectric quartz and accurately ground so that it vibrates at a particular frequency 石英晶躰