____滚弯时不仅需将上滚轴倾斜一定角度,而且在滚弯过程中上滚轴需根据曲率的大小作上下移动以保证不同直母线的变曲率滚弯。
A. 单曲度蒙皮零件
B. 等曲率圆筒形件
C. 锥型件
D. 变曲率形状
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____是板料从2~4根同步旋转的辊轴间通过,并连续产生塑性弯曲的一种成形方法。
等曲率圆筒形件滚弯时,3个滚轴的位置需要倾斜一定的角度。
A. 对
B. 错
滚弯成形是连续产生塑性弯曲的一种成形方法度。
A. 对
B. 错
What does the speaker say about animals in winter?[音频]
A. They have to look for food and shelter underground.
B. They take little notice of the changes in temperature.
C. They resort to different means to survive the bitter cold.
D. They have difficulty adapting to the changed environment.