所有焊接承重钢结构的钢材，均应具有()的合格保证以及硫、辚、碳含量的合格保证。

• A.<img src="https://timg.fentiku.com/img/2018-04-09/5acadef90aa5f.png" alt="" />
• B.<img src="https://timg.fentiku.com/img/2018-04-09/5acadef930010.png" alt="" />
• C.<img src="https://timg.fentiku.com/img/2018-04-09/5acadef94cd07.png" alt="" />
• D.<img src="https://timg.fentiku.com/img/2018-04-09/5acadef96ec07.png" alt="" />

正确答案：B