Warning: file_put_contents(): Only 0 of 6116 bytes written, possibly out of free disk space in /home/www/wwwroot/zidian/001308.com/index.php on line 55 gamma shield例句_gamma shield英汉例句_gamma shield双解例句_零食美味英文词典
To reduce gamma ray background a cylindrical lead shield (100 mm thick) with a fixed bottom and movable cover shielded the detector. 爲了減少伽瑪射線背景圓柱底部固定和移動蓋屏蔽探測器。