什么是低温脆性？低温脆性是指材料的冲击吸收功随温度降低而降低，当试验温度低于Tk(韧脆临界转变温度)时，冲击吸收功明显下降，材料由韧性状态变为脆性状态，这种现象称为低温脆性。
What is low temperature brittleness? Low temperature brittleness means that the impact absorbed energy of material decreases with the decrease of temperature. When the test temperature is lower than TK (critical transition temperature of toughness and brittleness)， the impact absorbed energy decreases clears， and the material changes from ductile state to brittle state. This phenomenon is called low temperature brittleness.
冷热水管不要同槽
水路改造时，冷热水管要不要同槽，而且两者之间距离保持10cm以上。如果热水管紧挨冷水管，会降低热水管的保温性，热水很快就会变冷。这里还要提醒大家，水管开槽较深，要避免开开横槽，横槽会***墙体结构。
Hot and cold water pipes should not be in the same tankIn waterway rectruction， whether the cold and hot water pipes should be in the same groove， and the distance between them should be kept at least 10 cm. If the hot water pipe is close to the cold water pipe， the heat preservation of the hot water pipe will be reduced，ppr管件， and the hot water will soon become cold. Here also reminds everybody， the water pipe groove is deep， must ***oid to open the transverse groove， the transverse groove will destroy the wall structure.
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