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【多选题】
以下关于钢的表面热处理说法正确的是()。A.
钢经过表面淬火后，整个零件均可获得淬火组织
B.
化学热处理可以提高零件的抗腐蚀性与抗氧化性
C.
渗碳主要用于表面受严重磨损，并在较大的冲击载荷下工作的零件
D.
火焰表面淬火质量不够稳定，工作条件较差
E.
渗碳后的零件很难保证零件的塑性和韧性
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【简答题】2016最新元宵灯谜 举杯邀明月打四字词语
【简答题】Thatched houses are still preferred because of ________. A) their style. and comfort B) their durability C) their easy maintenance D) their cheap and ready-made materials
【单选题】Thatched houses are still preferred because of ______.
A.
their style. and comfort
B.
their durability
C.
their easy maintenance
D.
their cheap and ready-made materials
【单选题】Most houses still remain ___ even after 200 years.
A.
oppose
B.
conflict
C.
full
D.
intact
【简答题】举杯邀明月, 。
【简答题】The expression of 'Yet houses are still being erected today at vulnerable sites around Vesuvius' is used to show ______.
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