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【单选题】

齿轮盘铣刀是成形铣刀,其齿背是()结构。

A.
直线
B.
阿基米德螺旋线
C.
折线
题目标签:齿轮成形盘铣刀
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参考解析:
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举一反三

【单选题】Passage 3 Questions 11 to 15 are based on the following passage: Scientists in India have invented a new way to produce electricity. Their invention does not get its power from oil, coal or other fuel...

A.
Because bullocks have long been used by Indian people
B.
Because bullocks walk slowly and are easy to control.
C.
Because there are few non-working bullocks in India
D.
Because there is not enough oil in India.

【单选题】放置成形片的目的是防止

A.
食物嵌塞
B.
充填体过高
C.
充填体悬突
D.
充填体膨胀
E.
唾液渗入窝洞