The research project has only been under way for three months,so it's too early to___ its success. [ ]

A. convey  

B. evaluate 

C. tend

D. stress

钢筋电弧焊分（）等接头形式。

A.帮条焊

B.搭接焊

C.坡口焊

D.熔槽

E.平口焊