在碳素结构钢中,屈服点为235,质量等级为A的沸腾钢,其牌号应为( )。
A.C0235-AF
B.F235-AT
C.GB/Q235-AF
D.Q235-AF
参考答案:D
各年累计盈余资金不出现负值是财务上可持续的必要条件( )。
A.不出现正值B.不出现负值C.出现正值D.出现负值
At a construction site in our city the workers have uncovered an ancient wall that_______ to keep the enemy out of the city, but it requires further evidence.
A.might have functioned
B.would have functioned
C.must have functioned
D.should have functioned