GB/T 13982-2005.The reflective and transmitting projection screens. 5.13伸缩 银幕安装后不应有不正常的伸长或收缩. 5.14幕面...

GB/T 13982-2011.The reflective and transmitting projection screens. GB/T 13982规定了反射和透射放映银幕的基本类型、技术要求...