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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.
【单选题】若受零件空间限制，铣刀必须沿零件轮廓的法线方向切入和切出零件轮廓时，则可将其切入、切出点选在零件轮廓______________。
A.
圆弧顶点处
B.
两几何元素的交点处
C.
直线中心处
D.
曲线凹陷处