A: 正确
B: 错误
举一反三
- Annealing and normalizing present a significant difference on the ductility of low carbon steels. A: 正确 B: 错误
- 中国大学MOOC: Annealing and normalizing present a significant difference on the ductility of low carbon steels.
- To improve the machinability of low carbon steel, the heat treatment process usually used is ( ) . A: quenching B: tempering C: annealing D: normalizing
- are very soft ,and can be used for bolts and for machine parts that do not need strength.: Alloy steels|High carbon steels|Low carbon steels|Medium carbon steels
- ____is<br/>a low-temperature heat treatment used to eliminate all or part of the<br/>effect of cold working in steels. A: Normalizing B: Spheroidizing C: Annealing D: Process<br/>annealing
内容
- 0
For low carbon steels, the Hooke's law σ=Eε is applicable when the unidirectional tensile stress is not greater than ___.
- 1
The common heat treatment on steels such as 65Mn and 60Si2Mn is . A: quenching + low temperature tempering B: quenching + medium temperature tempering C: quenching + high temperature tempering D: normalizing
- 2
英译汉： Carbon steel(碳钢) Martensite(马氏体) Pearlite(珠光体) Cementite(渗碳体) Ferrite(铁素体) Austenite(奥氏体) annealing(退火), normalizing(正火), quenching(淬火), and tempering(回火)
- 3
During heat treatment of steel, austenite transforms into martensite by A: annealing B: austenitizing C: quenching D: normalizing
- 4
Which of the following statement describes correctly the purpose of analysis of the variance? A: To analyze whether there is a significant difference in the total variance of each group B: To analyze whether there is a significant difference in the overall standard deviation of each group C: To analyze whether there is a significant difference in the overall mean value of each group D: To analyze whether there is a significant difference in the overall median of each group