单选题
1分
From viewpoint of practice, it is sometimes important to detect abnormal happenings in the running g...
From viewpoint of practice, it is sometimes important to detect abnormal happenings in the running gear by ____.
参考答案: A
参考解析: 从实践的观点来看,敏锐的听觉对探测运行机构的异常有时很重要。