皮皮学，免费搜题
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【单选题】
车削 HT200 铸铁材料,形成
A.
带状切屑
B.
节状切屑
C.
崩碎切屑
D.
粒 状切屑
拍照语音搜题，微信中搜索"皮皮学"使用
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【简答题】Have you ever noticed that your fingertips are winked when you’ve just finished swimming or washing dishes? It seems as if your hands have aged 30 years in a second. But is this an accident? Or is it ...
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