行业专家估计，几乎所有此类热水器的水中都含有因重复加热而导致水中的硝酸盐产生的大量亚硝酸盐。
Industry officials estimated that almost all the water produced by such heaters contains high levels of nitrite - produced from nitrate in water that is repeatedly heated.
如果在加热时冒烟、颜色变为深棕色，或者有恶臭味，重复使用则不安全。
If it smokes upon heating, turns deep brown, or has a foul odor, it is not safe to reuse.
这类材料由具有加热软化、冷却硬化甚至可重复循环能力的聚合物组成。
This class of materials consists of polymers which always remain capable of being softened by heat and of hardening on cooling, even after repeated cycling.
可调节加热保温过程的功率、时间、有利于提高加热的质量和加热的重复性，简化工人之操作简单。
The power and time in the process of heating and heat preservation can be adjusted, which may be useful to promote heating quality and heating repeatability, simplify workers' operation.
根据数值模拟结果分析了粉末粒度对火焰焰流速度和温度的影响，用不同粒度参数重复模拟计算，这对喷涂粉末的加速和加热性能具有重要意义。
Result of numerical simulation analyses powder grain size influence to velocity and temperature of flame, repeat with different grain size parameter simulation calculate, it has impo...
根据数值模拟结果分析了粉末粒度对火焰焰流速度和温度的影响，用不同粒度参数重复模拟计算，这对喷涂粉末的加速和加热性能具有重要意义。
Result of numerical simulation analyses powder grain size influence to velocity and temperature of flame, repeat with different grain size parameter simulation calculate, it has impo...
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