题目内容：
自2008年1月以来，制造业和非制造业经济总体衰退的次数各有几次?（ ）
参考答案：
答案解析：
单选题：自2008年1月以来，制造业和非制造业经济总体衰退的次数各有几次?（ ）
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- 题目类型：单选题
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