单项选择题

In customer service, expanding business means looking for new business, recommending new products, including new customers and new opportunities.

A.对
B.错
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问答题

什么被被喻为工业生产的“心脏”?

答案: A、芯片
B、水泥
C、电路板
D、材料
正确答案:芯片
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