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1·For large work pieces preheating is recommended.

用于大焊件时建议预热。

2·Batch and cullet preheating systems: using furnace waste gases.

配料和碎玻璃预热系统：采用窑炉废气热能。

3·Need not preheating, turn a few minutes to reach set temperature.

不需预热，开机几分钟内即可达到设定温度。

4·Preheating is required if either of these two conditions are not met.

如无法满足两个条件中任意一条，则需要进行预热处理。

5·Condensate from the first-effect calandria is used for preheating the feed.

一效列管换热器中出来的冷凝液被用来预热进料。

6·The processes of preheating and welding of super scale penstocks were detailed.

本文详细叙述了巨型压力钢管的预热装配和焊接过程。

7·Preheating temperature shall be kept uniform from the start to the end of welding.

预热温度在焊接开始到结束期间应保持均衡。

8·Preheating process is very important because it affects machining quality directly.

预热效果直接对加工质量产生很大的影响。

9·Proper selection of materials, preheating and postheating can help to avoid cracking.

适当的选材与低温预热及后热可以抑制表面裂纹的产生。

10·The key of the technology was designing ideal process by using suitable preheating method.

该技术的关键是采用合理的预热方式，设计出理想的工艺流程。

预热

1·The atrium hall also functions as a natural preheating of fresh air, thus contributing to over all energy efficiency.

中庭大厅也有一种预热天然的新鲜空气的功能，从而提高了所有的能源效率。

2·The solution: you should use lower viscosity of the oil when the temperatuer. And every engine shoule be equipped with preheating device, should preheat several times before ignion.

解决办法：在气温较低时，应使用粘稠度低一点的机油。还有就是每台发动机都配有预热装置，打火之前应多预热几次。

3·Single pass laser surface of the specimens using powder feeding method were obtained by varying the powder feeding rate and the preheating temperature of the substrate.

通过改变送粉激光熔覆过程中的扫描速度、送粉速率、基体预热温度等工艺参数，获得了单道激光熔覆层。

4·Condensate from the first-effect calandria is used for preheating the feed.

一效列管换热器中出来的冷凝液被用来预热进料。

5·Batch and cullet preheating systems: using furnace waste gases.

配料和碎玻璃预热系统：采用窑炉废气热能。

预加热

1·Abstract: Objective To determine both short-term and long-term effect of preheating on the microhardness of 4 composite resins.

摘要目的探讨预加热对4种光固化复合树脂显微硬度近期及远期的影响。

(1)preheating zone预热带；预热区；初步供暖区

(1)preheating furnace[化]预热炉