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.
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