对择优选择承建单位最有利的工程承发包模式是( )。

A．平行承发包

B．设计和施工总分包

C．项目总承包

D．设计和施工联合体承包

Your tank vessel is loaded down to her marks, and you find that she has too much trim by the stern,To adjust the trim, you may（）.

A.add ballast forward

B.load more cargo forward

C.shift bunkers forward

D.All of the above