In order to have _____ better understanding of the accident, the three witnesses were called for _____ second meeting．

A．a; a

B．the; a

C．a; 不填

D．不填; the

从市场交易的角度看，( )是投资者和承包商双方共同认可的、由市场形成的价格。

A．固定资产投资
B．建筑安装工程造价
C．总承包合同
D．修正概算造价