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【单选题】
正变位齿轮，是指（ ）。
A.
加工齿轮时，不采用标准安装，而是将刀具相对于轮坯中心向外移出一段距离
B.
加工齿轮时，刀具与被加工齿轮采用标准安装
C.
加工齿轮时，不采用标准安装，而是将刀具相对于轮坯中心向内移近一段距离
D.
一种称呼，与刀具如何安装无关系
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参考答案：
参考解析：
刷刷题刷刷变学霸
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.