短语词组短语spring back radial seal 弹簧支撑径向密封back -blade seal 背叶片密封poly -silicon back-seal 多晶硅背封Liquid Back Seal 右密封Back seal gas 冲吹气体Back seal test 上密封试验;上弥缝实验;上密封实验;上弥缝测试Back Seal Automatic Packing Machine 背封式自动包装机 返回 back seal