... 3.4降温时间cooldown time 3.5渡越容量crossover value 在通入测试气体期间，低温泵二级冷头温度保持在20 K或20 K以下时允许瞬间流入低温泵的氮气气量，单位为Pa·m3或Pa·L。 ...
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actual crossover value 实际交换值
N the percentage of offspring showing recombination among the total offspring of a given cross. It indicates the amount of crossing over that has occurred and therefore the relative positions of the genes on the chromosomes 交换值 ( abbr: COV) [genetics]
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