在下列符号中，钢的硬度符号为（）。

A .https://assets.asklib.com/images/image2/2017072115032936557.jpg B .https://assets.asklib.com/images/image2/2017072115033248583.jpg C .https://assets.asklib.com/images/image2/2017072115033662231.jpg D .https://assets.asklib.com/images/image2/2017072115033963278.jpg

A .https://assets.asklib.com/images/image2/201707211449324099.jpg B .https://assets.asklib.com/images/image2/20170721144949173.jpg C .https://assets.asklib.com/images/image2/2017072114500678859.jpg D .https://assets.asklib.com/images/image2/2017072114502813596.jpg

A . 空格 B . +（加号） C . -（减号） D . \（斜杠）

A .https://assets.asklib.com/images/image2/2017072114531866328.jpg B .https://assets.asklib.com/images/image2/2017072114533211163.jpg C .https://assets.asklib.com/images/image2/2017072114534568917.jpg D .https://assets.asklib.com/images/image2/2017072114535963752.jpg

A .https://assets.asklib.com/images/image2/2017072114561637313.jpg B .https://assets.asklib.com/images/image2/201707211456301444.jpg C .https://assets.asklib.com/images/image2/2017072114564554551.jpg D .https://assets.asklib.com/images/image2/2017072114570038725.jpg

A .https://assets.asklib.com/images/image2/2017072114545148658.jpg B .https://assets.asklib.com/images/image2/2017072114550784785.jpg C .https://assets.asklib.com/images/image2/201707211455202376.jpg D .https://assets.asklib.com/images/image2/2017072114553414165.jpg

A .https://assets.asklib.com/images/image2/2017072115004464122.jpg B .https://assets.asklib.com/images/image2/2017072115010158853.jpg C .https://assets.asklib.com/images/image2/2017072115014171333.jpg D .https://assets.asklib.com/images/image2/2017072115020567686.jpg

A .https://assets.asklib.com/images/image2/2017072114574367165.jpg B .https://assets.asklib.com/images/image2/2017072114575868720.jpg C .https://assets.asklib.com/images/image2/2017072114581356428.jpg D .https://assets.asklib.com/images/image2/2017072114582940248.jpg

A . A．i=u/XC B . B．I=U/XC C . C．P=0 D . D．Q=IU

A . 七种标准项目符号 B . 自定义项目符号 C . 使用图形制作的项目符号 D . 使用【微软拼音输入法2.0】软键盘的特殊符号制作的项目符号

A .https://assets.asklib.com/images/image2/2017072114513717719.jpg B .https://assets.asklib.com/images/image2/201707211451538398.jpg C .https://assets.asklib.com/images/image2/2017072114520776285.jpg D .https://assets.asklib.com/images/image2/2017072114522672107.jpg

A . A、kg/m B . B、Mpa C . C、MPa-1 D . D、mPa·s

A . const int M1=10 B . const int M2=20 C . const int M3 10 D . const char mark=’3&rsquo

A . HRC； B . σ ； C . α ； D . K 。

A . A B . B C . C D . D

A . A．i=u/XL B . B．I=U/XL C . C．Im=Um/XL

A . A、https://assets.asklib.com/psource/2015120414581674705.jpg B . B、https://assets.asklib.com/psource/2015120414582373804.jpg C . C、https://assets.asklib.com/psource/2015120414582896756.jpg D . D、https://assets.asklib.com/psource/2015120414583123262.jpg

A .https://assets.asklib.com/images/image2/2017072114591252536.jpg B .https://assets.asklib.com/images/image2/2017072114592865509.jpg C .https://assets.asklib.com/images/image2/20170721145941493.jpg D .https://assets.asklib.com/images/image2/2017072115000187380.jpg

A . T10； B . 20； C . 65；

A .https://assets.asklib.com/images/image2/2017072115042483913.jpg B .https://assets.asklib.com/images/image2/2017072115043719536.jpg C .https://assets.asklib.com/images/image2/2017072115045349265.jpg D .https://assets.asklib.com/images/image2/2017072115050719231.jpg

A . T12 B . T8 C . 20 D . 65Mn

<img src='https://img2.soutiyun.com/shangxueba/ask/18576001-18579000/18576113/2015121511164650228.jpg' /> A．A B． B C． C D． D

A．1s B．2d C．7p D．5f

A．过程流程图 B．作业指导文件 C．制程检查记录表 D．控制计划