施工合同条件下,为使承包商有较充裕的流动资金用于施工,而允许承包商以保留金保函代换保密金的前提是,保留金已累计扣留到保留金限额的( )%。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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