gb/t12690.8-2003 gb/t12690.10-2003 gb/t12690.11-2003 gb/t12690.12-2003 gb/t12690.13-2003 gb/12690.6-2003 gb/12690.7-2003 gb/t12608-2003 gb/12690.5-2003 gb/t12607-2003