题目内容

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

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G71可用于轴内轮廓复合循环粗加工。

A. 对
B. 错

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。

A. 对
B. 错

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。

A. 对
B. 错

在数控车床上钻孔、扩孔和铰孔时，应在一次装夹中将外圆、端面车削一次完成，以保证同轴度和垂直度。

A. 对
B. 错