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虽然麻花钻的一般外形在过去半个世纪中变化甚小,但实际上麻花钻已有了巨大的变化和改进。本文评述了过去十年中麻花钻在设计和使用上的某些重大发展。
Although the general appearance of twist drills has changed little in the past half century, twist drills have actually undergone tremendous changes and improvements. This article reviews some of the major developments in the design and use of twist drills in the last decade.