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 发现了种方法,将 50 对电线(后来增加
2400 对)拧成
根电缆,用纸包起来,用铅
成型,现在电线从电线杆上取下来,放在地下
管道中。