单项选择题
A.60sB.30sC.180sD.120s
A.必须用刮黑机来处理碳化的皮屑B.可以用燎毛炉燎毛C.可以用火焰喷灯燎毛D.可以用剖检刀扫毛
A.82℃B.70℃C.75℃D.60℃
A.1minB.45sC.1.5minD.30s
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