thatwhich在下面的句子中为何可以连用,是什么意思?Duringtheone-yearwarrantyperiod,ifthesizeandload-rangeratingofthetireareequaltoorgreaterthanthatwhichthemanufacturerspecified,wewillreplacethetirefreeof

Question

that which 在下面的句子中为何可以连用,是什么意思?
During the one-year warranty period, if the size and load-range rating of the tire are equal to or greater than that which the manufacturer specified, we will replace the tire free of charge or refund the cost if either of the following occurs.

Answer 1

此处that为避免重复而用作代词,指代前面的rating,（尺寸和负载）范围.which为引起定于从句的关系代词,修饰限定that,以为“制造商所说明的范围”