动脉DSA是()
A.IVDSA
B.IADSA
C.动态DSA
D.时间减影
E.蒙片
参考答案:B
Our football team _____ every match so far this year, but we still have three more games to play.
A.was winning
B.had won
C.has won
D.wins
为什么要讨论劳动力的充分利用问题?解决这一问题有何重要意义?