If you are only counting people who speak their first language, which is the largest langauge in the world?
A. Chinese
B. English
C. Hindi
D. Spanish
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镶齿铣刀齿片的材料应采用_____。
A. 硬质合金
B. 合金工具钢
C. 高速钢
D. 碳素工具钢
在切削过程中切削力波动较小的切屑形态为_____。
A. 节状
B. 带状
C. 蹦碎
有人说,钳工作为一种古老的加工工艺,应该被淘汰了,这个说法对吗?