题目内容
共用体类型的声明与结构体类型声明方法相同，但含义不同。
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Read this blog entry. Then, choose the correct answers.1 What is the blog mainly about? ()A how an ancient building was constructedB why shapes are important to architectsC why students learn about geometric shapesD which shapes provide the best support2 A column is an example of a(n) ()A cylinderB ovalC squareD arch3 Which shape is NOT used in the Coliseum? ()A a semicircleB an ovalC a rectangleD a circle
G71可用于轴内轮廓复合循环粗加工。
G71U(△d）R（e）；G71P(ns）Q（nf）U （△ u ）W（△w）F(f）S（s）T（t）；指令中，外径加工时ΔU值为正，内孔加工时ΔU值为负。
外径加工时循环起点在材料外侧，内孔加工时循环起点在材料内侧，取略大于预钻孔直径。
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