判断题

45钢在油中淬火比在水中淬火硬度高。
正确
错误

答案：错误

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个人投资房地产主要投资于住宅。( )

答案：错误

不定项选择

Companies should first think of the target market and then design the supply chain backward from that point. This strategy is called demand chain planning.
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A．正确
B．错误