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Twist drills are usually made of high-speed steel, although carbide-tipped drills are also available.
虽然也有硬质合金刀尖的钻头,麻花钻一般用高速钢制成。
youdao
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Twist drills are usually made of high-speed steel, although carbide-tipped drills are also available.
虽然也有硬质合金刀尖的钻头,麻花钻一般用高速钢制成。
youdao