题目

The Bakers arrived last night, if they'd only let us know earlier, ___ at the station.   A. we'd meet them B. we'll meet them   C. we'd have met them D. we've met them   答案：C 下列关于酶的竟争性抑制作用的说法正确的是          (      )    A． 抑制剂结构一般与底物结构相似       B．  Vmax术变    C． 增加底物浓度可减弱抑制剂的影响    D． 使Km值增大