但他们已经在联邦交通部的项目化了四年的时间。 这个项目旨在削减40英尺长的城市公共汽车的没有必要的每一盎司的重量。
They’d spent four years working on a federal Department of Transportation project to cut every extraneous ounce from a 40-foot city bus.
常规室温下固化聚酯的经验法则是:直线每一英尺的收缩量为1/32英寸(当加强玻纤重量比为25%时)。
A general rule of thumb for conventional room-temperature cured polyesters is 1/32 inch of shrinkage per linear foot when reinforced with 25 weight percent glass content.
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