According to the conversation where does Andy probably plan to live?
Abroad
B. In prison
C. In the city
D. At home
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
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