单词 | ultrasonic drill |
释义 | ultrasonic drill [¦ǝl·trǝ`sän·ik `dril] MECHANICAL ENGINEERING A drill in which a magnetostrictive transducer is attached to a tapered cone serving as a velocity transformer; with an appropriate tool at the end of the transformer, practically any shape of hole can be drilled in hard, brittle materials such as tungsten carbide and gems. |
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