This is I wanted. [ ]
A. The one what
B. which
C. one which
D. the one
答案：D
CRH1A动车组每个动力车的电机侧变流器MCM控制（）台牵引电机。
A.1
B.2
C.3
D.4
汽轮机共有几段抽汽？分别供至哪里？
