A.180 B.419 C.232 D.153
A.sink roll B.pinch roll C.steering roll D.deflector roll
A.1000 B.1300 C.1400 D.1200
A.0 B.50 C.100 D.150
A.聚氨酯 B.特殊铜合金 C.碳化钨 D.合金工具钢
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