History

Time	Change
2020-10-10 03:46:02+00:00	Created
2020-10-10 03:46:02+00:00	Associated with GB/T 17961-2010
2020-10-10 03:46:14+00:00	Associated with GB/T 17961
2020-10-10 03:46:14+00:00	Associated with GB/T 17961-2000