【单选题】—These farmers have been to the United States . —Really ? When _____ there ? A. will they go B. did they go C. do they go D. have they gone
【简答题】下图所示支承构造可以简化为哪种支座形式?____。
【简答题】图示两种支承可以简化为下列哪两种支座形式?( )
【单选题】下图所示支承构造可以简化为哪种支座形式?()。
【单选题】-These farmers have been to the United States. -Really ? When there ?