This paper reports an eolation used several years since 1993 for weight calculation of casting MC Nylon tubes.
介绍旋转浇铸法制作MC尼龙管浇铸量计算公式。
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Then Barrett discovered a method of twisting fifty pairs of wires — since grown to 2400 pairs-into a cable, wrapping them in paper and molding them in lead, and the wires were now taken from poles and placed in conduits underground.
然后 Barrett 发现了一种方法,将 50 对电线(后来增加到 2400 对)拧成一根电缆,纸包起来,铅浇铸成型,现在电线从电线杆上取下来,放在地下管道中。