皮皮学，免费搜题
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【判断题】
制造性生产多是资本密集型的，而服务性运作相对来说通常是劳动密集型的。A.
正确
B.
错误
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皮皮学刷刷变学霸
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【简答题】烟酸缺乏时可引起 ,主要累及皮肤、消化系统、神经系统,其典型病例可有 、 和痴呆,又称 “三 D ”症状。
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