题目内容

According to the conversation where does Andy probably plan to live?

Abroad
B. In prison
C. In the city
D. At home

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What does Andy ask the bank clerk to do?

A. Open the mail.
B. Send the mail.
C. Keep the mail.
D. Copy the mail.

按照含碳量划分,15钢,20钢都属于( )

A. 低碳钢
B. 中碳钢
C. 高碳钢
D. 合金钢

高碳钢的含碳量是大于0.6%。

A. 对
B. 错

简述互换的主要种类。

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