通过调整加热圈的位置来改变受热区长度。
By adjusting the site of the heating ring, the length of zone of heating can be modified.
缓慢地逐渐换水，使用较清凉的水。并调整加热。
Slowly lower water temperature by gradually replacing it with cooler water. Adjust heater.
本实用新型的优点是：能调整加热功率且无毒性气体排出。
The utility model has the advantages that the heating power can be regulated, without toxic gas being discharged.
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