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。
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