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尿素型的防冻剂——KD型和LJD型,经过了试产和试用,又经过一个冬期的试验研究和实践应用的检验,证明这两种复合防冻剂性能可靠,可以推广应用。
The urea-type antifreezes—KD type and LJD type—have passed trial production and trials, and after a winter period of experimental research and practical application tests, these two types of composite antifreeze have proved to be reliable and can be applied.