【多选题】【消耗次数：1】
投资组合战略的影响因素有()。
①
盈利与风险
②
政府政策
③
经营规模
④
产业性质
⑤
进入壁垒
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进入壁垒高和退出壁垒高对产业获利能力影响表现为（[填空]。
【单选题】
生物制药是具有高成长性行业，其进入壁垒和退出壁垒的组合是（ ）。
①
进入壁垒高，退出壁垒高
②
进入壁垒低，退出壁垒低
③
进入壁垒低，退出壁垒高
④
进入壁垒高，退出壁垒低
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