explosion-proof instrument的意思|示意

防爆型仪器仪表 explosion-proof electric actuator，防爆型电动执行机构 explosion-proof instrument，防爆型仪器仪表 explosion-proof solenoid valve，防爆型磁阀 ..

防爆式仪器仪表 ... expansion thermometer 金属膨胀温度计 explosion-proof instrument 防爆式仪器仪表 extensibility meter 延伸率计 ...