Warning: file_put_contents(): Only 0 of 5025 bytes written, possibly out of free disk space in /home/www/wwwroot/zidian/69228.com/index.php on line 55 最近高清无吗免费看,在线观看免费一级无码婬a片
Large size CaF_2 crystal has been grown by the Bridgman-Stockbarger method using a graphite crucible. 採用真空坩堝下降法在石墨坩堝中生長了大尺寸CaF_2晶躰。 bbs.chinadaily.com.cn