[img src="https://img.haodaxue.net/uploadimg/image/20200606/20200606170601_20322.png" alt="" />
A.1
B.-1
C.i
D.-i
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正确答案: C 答案分析:img src="https://img.haodaxue.net/uploadimg/image/20200606/20200606170654_77675.png" alt="" />
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