英语词汇“countersink bit”造句子简单的方法、技巧、例句及翻译-英语例句辞典

单词	countersink bit
例句	countersink bit The valves, C, and their seats, B, bored with a countersink bit, are plainly shown. The Boy Mechanic: Volume 1 700 Things for Boys to Do
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