【单选题】【消耗次数：1】
外周血干细胞采集技术要求正确的是
①
14天内采集不超过6次
②
14天内采集不超过5次
③
处理循环血量上限：2倍血容量
④
采集时间上限： 每次不超过6小时
⑤
采集时间上限：每次不超过8小时
参考答案：
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