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单项选择题

( )主要用于加工较大的平面,可用于铣床铣床上加工台阶面和平面。
A、球头铣刀
B、键槽铣刀
C、面铣刀
D、成型铣刀

判断题

Symbolism is the use of symbols, such as a person, a thing, an action or an event to signify ideas and qualities. It is used in literature to allow authors to be objective while still expressing his/her views.
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