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【简答题】
已知复数z=a+bi（a、b∈R），且满足 a 1-i + b 1-2i = 5 3+i ，则复数z在复平面内对应的点位于第______象限．
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【简答题】完成人名地名连接程序,要求输入输出如下图所示
【单选题】听力原文：W: Oh, really, as a staff member of the radio station, I'm actually quite happy to know that.Well, what do you have to decide first when there is a vacancy? M: My first decision would be whether ...
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Taking care of customers．
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Recruiting the right person for the right job．
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Promoting the company products．
【单选题】What are visitors asked to do before entering the site?
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Contact a staff member
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Have a health check
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Fill out a form
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Clean their hands
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