Warning: file_put_contents(): Only 0 of 6160 bytes written, possibly out of free disk space in /home/www/wwwroot/zidian/201990.com/index.php on line 55 low-atomic-number material例句_low-atomic-number material英汉例句_low-atomic-number material双解例句_耀久九英英词典
The density measurement technology of foam material with low atomic number was established by low energy X-ray radioscopy . 采用低能X射线对低原子序数泡沫样品进行透射照相，以胶片作为记录介质，对材料密度进行测量。