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看指标库,很多都只有卖出规则、排序规则，没有买入规则，是什么道理?（比如公开策略中的"原始策略"）如果只有排序规则倒也好理解，一直满仓轮动，但只有卖出规则，没有买入规则，那卖出清仓后，什么时候买入呢？
同问，为什么没人回答
