protective gap保护放电器,保险隙protectiveadj.保护的；防卫的protective site clothing防护服protective belt of beach护滩带protective layer control保护层控制protective architectures保护建筑protective antigen genes抗原决定簇基因protective ground system保护接地系统Protective LASER Devices防护性激光装置protective barrier cream防护性屏障霜protective success ratio保护成功率protective sanitary zone卫生防护区