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【简答题】
当行业处于长期均衡状态时，同一行业的所有厂商必须只能获得正常利润。( )
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皮皮学刷刷变学霸
举一反三
【单选题】Today I change my impression of you. You play guitar very well. It’s very________ !
A.
special
B.
outstanding
C.
attentive
D.
impressive
【简答题】Thank you for joining CCTV’s Around The World show. Today, we’re in Australia. It’s a beautiful, 1 day! There are many people here 2 vacation. Some are taking photos. 3 are lying on the beach. Look at...
【简答题】Thank you for joining CCTV’s Around The World show. Today, we’re 51 Australia. It’s a beautiful sunny day! There 52 many people here on vacation. Some are taking photos. Others are 53 on the beach. Lo...
【简答题】亚共析钢淬火加热温度为 、共析钢和过共析钢淬火加热温度为 。(参考PPT)
【多选题】以下说法正确的是( )
A.
疲劳过程是由裂纹萌生、亚稳扩展及最后失稳扩展所组成的
B.
在高频疲劳试验机上测定疲劳裂纹扩展曲线时，要先预制裂纹
C.
裂纹在Ⅱ区扩展速度最快
D.
Ⅱ区是裂纹扩展的主要阶段
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