...电预热； 热风预热； 热水预热 [gap=680]directly buried insulating pipe; preheating installation without com- pensation; electric preheating; hot wind preheating; hot water preheating ..
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The effect of preheating, test-piece thickness and coupling agents on the electric properties and the mechanical properties of the materials have been specially studied.
试验结果表明，模压前合理的预热可以显著地提高酚醛塑料的电性能及力学性能；
The preheating and lamp removed protection functions of the electric ballast can be implemented by the IR2153 added a few peripheral components and devices, the operation principle is described.
在I R 2153外围增加少量元器件，可实现电子镇流器的预热和无灯负载时的保护功能，叙述了其工作原理。
The effects on electric properties of PZT ceramic were investigated, including preheating temperature, frequency, environment temperature and polarization.
研究了粉体预热温度、频率、环境温度等工艺参数及条件对PZT陶瓷电性能的影响。
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