不需预热，开机几分钟内即可达到设定温度。
Need not preheating, turn a few minutes to reach set temperature.
将含三氯乙醛废硫酸加水稀释后，不需预热，直接向废硫酸中通入水蒸汽进行蒸馏的方法处理含三氯乙醛废硫酸。
The waste sulfuric acid containing chloral was treated with new process, including diluted with water and directly steam distillating without pre-heating.
对于P 8材料，一般不需要预热，关于正确的预热和层间温度的要求，参见相应的WPS。
No preheating is required for P8 material in general. For the correct preheating and interpass temperatures, please refer to corresponding WPS.
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