车削细长轴时，由于刚性较弱，可在细长轴车刀上磨制（）以提高工艺系统刚性。
A.过渡刃
B.消振棱
C.负倒棱
D.刀尖圆弧
参考答案：B
— What do you usually do in the afternoon, Mrs. Smith?
— My afternoon ______ includes doing some shopping and walking my dogs.
[ ]
A. appointment
B. action
C. routine
D. performance
消防安全绳索不用应放入绳包中，以避免在运输、存储过程中对绳索造成损伤。
