冬季，为了减少天天放冷却水的麻烦和防止忘记放冷却水而冻坏机体，可在发动机的冷却系统加注防冻液。目前，常用的防冻液主要有乙二醇、乙醇、甘油——乙醇等。由于这些防冻液的成分及配制比例不同，其凝点（凝固温度）也有所不同。一般来说，所选用的防冻液的凝点应低于... In winter, in order to reduce the daily chill water and prevent forgetting to put the cooling water to freeze the body, the engine cooling system can be antifreeze. At present, commonly used antifreeze mainly ethylene glycol, ethanol, glycerol - ethanol and so on. Due to the composition of these antifreeze and the preparation of different proportions, the freezing point (freezing temperature) is also different. In general, the freezing point of the selected antifreeze should be lower than ...