进口钢筋冷拉后的质量应符合国产冷拉（）钢筋的各项要求冷拉钢筋的检查验收方法进行检查验收。

A.Ⅰ级

B.II级

C.Ⅲ级

D.Ⅳ级

From the ship owner’s point of view,（）is the most important advantage Inmarsat providing with.

A.business opportunity

B.good-quality radio telephone conversations

C.telex service

D.both B and C