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 国产精品自在拍在线播放,久久一本人碰碰人碰
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