题目内容

关于铸铁材料的力学性能,下列描述正确的是()。

A. 抗拉强度与抗压强度相同
B. 抗拉强度高于抗压强度
C. 抗拉强度低于抗压强度
D. 以上结论都不正确

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通过低碳钢拉伸破坏试验可测定强度指标 和 。

Conversation 1[音频]

A. It costs less money.
B. It offers more privacy.
C. It provides more comfort.
D. It helps make new friends.

Conversation 2[音频]

A. Send these children to school.
B. Help clean the tiny, dirty houses.
C. Give these children some money and food.
D. Have their daughter get to know such a life.

Conversation 3[音频]

A. Travel alone in safe places in India.
B. Follow the Indian culture and customs.
C. Wear the same clothes as the local women.
D. Choose another place to go instead of India.

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