下列粗糙度符号中（）表示零件表面机械加工粗糙度最比较光滑。

A . 最大允许值3.2μm B . 最小允许值3.2μm C . 最大允许值3.2mm D . 最小允许值3.2mm

A . 截止波长 B . 轮廓平均波长 C . 静态测量力

A .https://assets.asklib.com/psource/2014112217522671914.png B .https://assets.asklib.com/psource/2014112217523215891.png C .https://assets.asklib.com/psource/201411221752408565.png D .https://assets.asklib.com/psource/2014112217524774230.png

A . 正确 B . 错误

A . A、刀具装夹误差 B . B、机床的几何精度 C . C、圆度 D . D、刀痕和振动

A . ['['https://assets.asklib.com/psource/2014112217481916694.png B .https://assets.asklib.com/psource/2014112217482895704.png C .https://assets.asklib.com/psource/2014112217483675930.png

A .https://assets.asklib.com/images/image2/2017061710481327069.jpg B .https://assets.asklib.com/images/image2/2017061710481619847.jpg C .https://assets.asklib.com/images/image2/2017061710482017965.jpg D .https://assets.asklib.com/images/image2/2017061710483066725.jpg

A . ①②③ B . ①②④ C . ①③④ D . ②③④

A .https://assets.asklib.com/psource/2014112217561949008.png B .https://assets.asklib.com/psource/2014112217562626602.png C .https://assets.asklib.com/psource/2014112217563615628.png D .https://assets.asklib.com/psource/2014112217564314782.png

A . 正确 B . 错误

A . m B . Cm C . Vm D . mm

A . 正确 B . 错误

A . 用 B . 随便 C . 不用 D . 必须

A . 10 B . 12 C . 14 D . 16

A . 国家标准 B . 量块 C . 量条 D . 表面粗糙度样板

A .https://assets.asklib.com/psource/2014112217540495612.png B .https://assets.asklib.com/psource/2014112217540495612.png C .https://assets.asklib.com/psource/2014112217540495612.png D .https://assets.asklib.com/psource/2014112217540495612.png

A . A、3.2μm B . B、3.2mm C . C、3.2cm D . D、3.2m

符号<img src='https://img2.soutiyun.com/shangxueba/ask/18477001-18480000/18479807/2014122510403156820.png' />，表示用去除材料加工的方法得到的表面粗糙度Ra的上限值为（）。

A．{-*{1583589229503_58_937345.png}*-} B．{-*{1583589265602_90_937345.png}*-} C．{-*{1583589047207_53_937345.png}*-} D．{-*{1583589335860_59_937345.png}*-}