用法：当元组数超过设定的阈值时，该参数控制是否对成员请求应用NON empty子句的决策。
Usage: This parameter controls the decision on whether or not to apply a NON EMPTY clause on member requests when the number of tuples exceeds the set threshold.
如果通过使用Cartesian产品计算的元组数超过设定的阈值，将NON empty子句应用于查询。
If the number of tuples, calculated by using the Cartesian product, exceeds the set threshold; the NON EMPTY clause is applied to the query.
定量地求得丁-戊共聚物二元组分布及数均序列长度数据。
The dyad distribution and number-average sequence length of these copolymers were quantitatively determined.
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