以碳素工具钢为材料的对刀具应用范围有：铣刀、锯条、（）等。A

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问题单项选择题

以碳素工具钢为材料的对刀具应用范围有：铣刀、锯条、（）等。

A、板牙

B、车刀头

C、钻头

D、铣刀

答案

参考答案：A

单项选择题

复发性口腔溃疡很少见于

A．唇

B．颊

C．舌尖、舌腹、舌缘

D．牙龈、硬腭

E．软腭、悬雍垂

单项选择题

Which of the following most accurately describes a derivative security A derivative:()

A. has a payoff based on another asset.

B. always increase risk.

C. has no expiration date.