The classification and grade of steel are（）
举一反三
- In the soil pH classification, the corresponding pH range of the acid grade is: A: 5.5-7.5 B: 4.5-7.0 C: 5.0-7.0 D: 5.0-6.5
- 中国大学MOOC: An advantage of the job classification method is that the objective nature of the system makes it easy to write the class and grade descriptions.
- If the carbon content of a type of steel is 0.1%， this steel is a kind of （ ）. A: low-carbon steel B: medium-carbon steel C: high-carbon steel D: HTLA steel
- Steel structure is the engineering structures made of shaped steel and steel plate.
- Competely annealing is mainly used for ( ). A: hypoeutectoid steel B: eutectoid steel C: hypereutectoid steel D: all steel