1. The domestic hot water system combining solar hot water heater and gas hot water heater is introduced, and the calculation model for the hot water system is established. 介绍了太阳能热水器结合燃气热水器的生活热水系统，建立了热水系统的计算模型。
2. Reason of hot-cracking of resin sand lathe bed casting occurring have been analyzed. It is founded that Hot-crack was caused by the casting residual hot stress and sand badness hot effect. 分析床身铸件产生热裂纹的原因，发现热裂纹是铸件凝固过程中形成的残余热应力和型砂不良热效应相叠加的结果。
3. The domestic hot water system combining solar hot water heater and gas hot water heater is introduced, and the calculation model for the hot water system is established. 介绍了太阳能热水器结合燃气热水器的生活热水系统，建立了热水系统的计算模型。
4. Reason of hot-cracking of resin sand lathe bed casting occurring have been analyzed. It is founded that Hot-crack was caused by the casting residual hot stress and sand badness hot effect. 分析床身铸件产生热裂纹的原因，发现热裂纹是铸件凝固过程中形成的残余热应力和型砂不良热效应相叠加的结果。
5. the flash of light that accompanies an electric discharge in the atmosphere (or something resembling such a flash); can scintillate for a second or more. 大气中伴随放电现象的闪光或与之类似的闪光；通常可以连续几次放光。
网络释义
flash apparatus flasher flash gun spark flash unit 闪光器;
flash apparatus flasher flash gun spark flash unit 闪光器;
hot finished steel pipe hot rolled tube hot rolling steel tube 热轧钢管;
hot mill hot rolling machine hot rolling mill 热轧机;
hot finished steel pipe hot rolled tube hot rolling steel tube 热轧钢管;
