动车组车体结构设计主要包括：流线型车体结构设计、“ ”、车体的密封隔声技术。
A. 使用空心车轴
B. 使用三项鼠笼式牵引电机
C. 车体的轻量化设计
查看答案
动车组转向架中轴箱定位装置限制了“ ” 与构架间的相对运动。
A. 轮对
B. 车体
C. 电机
The person I complained is the supervisor
A. whom
B. to whom
C. who
D. to who
I find it hard to imagine a time when ___ to solve
A. no problems will be there
B. there will be no problems
C. no problems there will be
D. there no problems will be
The reason ____ he rejected our plan is that he had no faith in us
A. which
B. that
C. why
D. because
微信支付 
支付宝支付