Consists of an aluminum alloy still with lid and clamp assembly, ring burner, connection apparatus, graduate cylinder and thermometers.
铝合金结构，由盖、夹钳、环焰灯、连接装置、带刻度圆筒和温度计组成。
Heating boilers. part 3: gas - fired central heating boilers. assembly comprising a boiler and a forced draught burner.
供暖锅炉。第3部分：燃烧气体的集中供暖锅炉。锅炉和强制送风燃烧器组合设备。
Lamp cap, lamp cap assembly of lamp burner and lamp cap, and method for fastening lamp.
灯头，灯心和灯头的组合，以及灯的固定方法。
Lamp cap, lamp cap assembly of lamp burner and lamp cap, and method for fastening lamp.
灯头，灯心和灯头的组合，以及灯的固定方法。
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