等比数列an中,a5+a1=34,a5-a1=30,则a3=()。
A.5
B.-5
C.-8
D.8
E.±9
参考答案:D
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出租车行业管理的职责是统筹规划,综合平衡,制定法规研究政策,指导监督()。
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