槽钢制动梁裂纹故障只出现在制动梁槽钢闸瓦托根部上下三角加强板边缘的槽钢处。
参考答案：错
— We could have asked Miss Keller for help. She is always kind-hearted.
— Yes. A whole day _____. [ ]
A. will waste
B. had wasted
C. was wasted
D. would be wasted
为了保证瓦面有一定量的油膜，不至于产生热轴或烧损巴氏合金，保证齿轮的正常啮合，轴瓦与车轴轴间间隙要求在（）之间。
A.0.05～0.1mm
B.0.2～0.25mm
C.0.25～0.4mm
D.0.4～0.5mm
