在接通所有电源之前，盖好加热器的上端盖。
Reinstate the top cover before reconnecting connecting electrical supplies.
在接通所有电源之前，盖好加热器的上端盖。
Reinstate the top cover before reconnecting electrical supplies.
在上盖中部也制有一圆孔，圆孔穿过底座上端和底座之间螺旋固定连接。
The middle part of the upper cover is provided with a round hole which passes through the upper end of the base and is spirally and fixedly connected with the base.
在上盖中部也制有一圆孔，圆孔穿过底座上端和底座之间螺旋固定连接。
The middle part of the upper cover is provided with a round hole which passes through the upper end of the base and is spirally and fixedly connected with the base.
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