题目内容

延伸公差带用规范的附加符号表示。

A. 带圆圈的M
B. 带圆圈的P
C. 带圆圈的E

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对于形位公差项目，在进行图样标注时，主要标注三部分内容：、和。

A. 框格
B. 被测要素
C. 基准要素
D. 尺寸

以下哪些为导出要素？

A. 中心点
B. 轴线
C. 中心线
D. 中心面

指引线的箭头应指向公差带的宽度方向或直径方向。

A. 对
B. 错

Complete the sentences with words from the boxes.inbyduebecausewill1___2040, I think humans will have walked on Mars.2.This phenomenon is to a wide range of factors.3.The chart predicts that by the year 2060,the country's public transportation network_ be modernized.4 _as little as 20 years, coffee could become a luxury.5.This is probably ______of increasing levels of literacy around the world.