问题题干答案解析相关问题热门问题最新问题

问题详情

31. 优质非合金钢20g表示( )

A、含碳量为千分之20的容器用钢

B、含碳量为万分之20的容器用钢

C、含碳量为千分之20的锅炉用钢

D、含碳量为万分之20的锅炉用钢

时间：2021-09-01 16:44 关键词：青书学堂平顶山学院机械电子工程机械制造装备设计

答案解析

D

相关问题

boost的意思是:help or encourage to increase or improve
eloquent的意思是:fluent or persuasive in speaking or writing
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
A cabinet or space containing the controls or valves for the fixed firefighting system must be（）.
A cabinet or space containing the controls or valves for the fixed firefighting system must be（）.