Sheldon Silver, the State Assembly speaker, took a jab yesterday at Gov. George E. Pataki over the fact that Congress has yet to authorize the use of federal funds for a $6 billion rail link that the governor hopes to build from Lower Manhattan to Kennedy International Airport. ''We can expect more and more announcements like this,'' Mr. Silver, a Democrat, said during a ribbon-cutting ceremony for a new office space opening at 55 Water Street in Lower Manhattan. ''The place is right, the view is right and the transportation will be right. ... Right, Governor?''