题目内容

Behrman, in his old blue shirt, took his seat as the miner on an upturned kettle for a rock. (Para. 21)

A. Behrman wore his old blue shirt. He sat on a rock shaped like an upturned kettle, for Sue to paint.
Behrman, wearing his old blue shirt and sitting on an upturned kettle, served as Sue's model for the miner sitting on a rock.

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在零件图中对尺寸基准根据其作用分为（）两类

A. 设计基准和工艺基准
B. 长宽高基准
C. 主要基准和辅助基准
D. 合理基准和不合理基准

零件图的尺寸标注要求是：、、、。

尺寸标注常用的符号和缩写词：球的直径用，球半径用，倒角用，厚度用。

零件尺寸标注注意事项：零件上尺寸直接标注，避免出现标注尺寸要便于和。