分动外锁闭道岔可动心轨也采用多点牵引，18号道岔为（）。
参考答案：两点牵引
It is believed that today's pop music can serve as a creative force ______ stimulating the thinking of its listeners.
A．by
B．with
C．at
D．on
简述透平式压缩机流量特性的一般特点？
