protective gap保护放电器,保险隙protectiveadj.保护的；防卫的protective insulation cover绝缘保护护套层protective coverings' depthprotective/warm clothing防护/保暖服Protective enzymes activity保护酶活性protective relaying setting继电保护整定Protective enzyme activites保护酶活性protective grounding system保护接地系统Protective Vehicle Division保安车辆处protective under-clothing护身内衣protective signaling system保安信号系统