The textile sling criterion JB/T8521-1997 had been complied by JULI Sling Co.,Ltd and Beijing crane mechanical institute of china together in 1997.是什么意思_The textile sling criterion JB/T8521-1997 had been complied by JULI Sling Co.,Ltd and Beijing crane mechanical institute of china together in 1997.在线翻译_英语_读音_用法_例句