$6
General technical conditions for deep digital recording seismometers
深层数字记录地震仪通用技术条件
中华人民共和国地质矿产部
This standard is the original Chinese electronic standard.
After you successfully purchase, we will send the electronic version of this standard to your email address.
If you need translation, please contact email: ChineseStandardsLibraryS001@gmail.com.