When the strut extends, the lower centering cam mates with the upper centering cam.The above sentence means "当减震支柱伸出时，下部的中心凸轮与上部中心凸轮相匹配．"
A.1
正确答案是A
When the strut extends, the lower centering cam mates with the upper centering cam.The above sentence means "当减震支柱伸出时，下部的中心凸轮与上部中心凸轮相匹配．"
A.1
正确答案是A