关于E420，下列叙述不正确的是（）A．船用焊接结构用高强度淬火

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问题单项选择题

关于E420，下列叙述不正确的是（）

A．船用焊接结构用高强度淬火回火钢

B．断裂强度不低于420N/mm2

C．－40℃的韧性等级

D．E表示韧性等级

答案

参考答案：B

选择题

________full preparations, we decided to put off the meeting till the next week. [ ]

A. We did not make

B. We had not made

C. Not having made

D. Having not made

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