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【单选题】
下图为低碳钢的应力应变曲线,其拉伸变形的几个阶段表述最佳的是()。A.
oe段为弹性变形；es段为塑性变形
B.
oe段为弹性变形；esb段为塑性变形
C.
oe段为弹性变形；esbk段为塑性变形
D.
oe段为弹性变形；sbk段为塑性变形
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】判别级数 敛散性的正确方法是
A.
根据交错级数审敛法,这级数收敛
B.
因为关系式un>un+1,对于n并不成立,所以发散
C.
因为是两个收敛级数逐项相减, 所以这级数收敛
D.
因为 ,所以这级数收敛
【单选题】Why did President Bai make request for Dr. Mcnutt's meeting with Premier Li?
A.
To show that scientific research is highly respected in China
B.
To launch a scientific research
C.
To show political status
【简答题】(Para. 5) Why did President Bai of CAS make the request for Dr. McNutt’s meeting with Premier Li?
【判断题】Li Bai, who loved drinking and writing poetry, was a great romantic poet in the Tang Dynasty and was later called “Poet Immortal”.
A.
正确
B.
错误
【判断题】Li Bai, who loved drinking and writing poetry, was a great romantic poet in the Tang Dynasty and was later called "Poet Immortal".
A.
正确
B.
错误
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