The central shaft has integral taper for maximum rigidity.
中心轴拥有一个完整的锥拔，以达到最大的硬度。
Under the same experiment conditions, the shrunk stream diameter of upper taper sieve trays is maximum, common sieve trays' is second, and lower taper sieve trays' is minimum.
在同等测试条件下，经过上锥形筛孔的缩脉最大，其次是经普通筛孔的缩脉，最小的缩脉为经下锥形筛孔的缩脉。
Under the same experiment conditions, the shrunk stream diameter of upper taper sieve trays is maximum, common sieve trays' is second, and lower taper sieve trays' is minimum.
在同等测试条件下，经过上锥形筛孔的缩脉最大，其次是经普通筛孔的缩脉，最小的缩脉为经下锥形筛孔的缩脉。
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