股动脉搏动微弱或消失，下肢血压低于上肢，提示( )
A．动脉导管未闭
B．肺动脉高压
C．主动脉缩窄
D．肺动脉狭窄
E．右心室肥厚
参考答案：C
_____ was not until yesterday that he realized that he was wrong. [ ]
A. That
B. He
C. It
D. This
作为定标的主要依据是( )。
A．评标价
B．投标报价
C．评标报告
D．投标文件
