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以尿素为主剂的复合防冻剂,以代替货源紧缺、毒性较大的亚硝酸钠(NaNO_2)防冻剂。工程实践证明,在最低气温-10℃以上,我们所用的尿素型复合防冻剂配方在
The compound antifreeze agent based on urea as the main agent replaces the NaNO2 anti-freeze agent which is short of supply and more toxic. The engineering practice has proved that at the lowest temperature of -10°C or above, the urea-type compound antifreeze used by us is