“噢，”她有些不自在地说道，“是什么？”"Well," she said a little uneasily, "what is it?"克利福德正在边境北部自在地生活。Clifford is enjoying life north of the border.莫莉不自在地轻声干笑了一下。Mollie gave an uneasy little titter....
含碳的铌合金,若在高温下受氧沾污,易产生脱碳现象.In niobium alloy containing carbon occurs decarburization in case of contamination by oxygen at higher temperature.含%碳的钢(铁碳混合物的低共熔点),含%碳的碳钢是纯珠光体.A mixture of ferrite cementite forming distinct la...