Half the number of bolts in floating head of deethanizer overhead cooler were brittle fractured.
气体分馏乙烷塔顶冷却浮头螺栓,半数性断裂。
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They raised 80 bean plants, infested 40 of them with aphids two weeks after germination, and then, three days later, tested samples of the hydroponic solution of each using a process called bioassay-guided fractionation.
他们培育了 80 株豆类植物, 在发芽两周后用蚜虫感染了其中的 40 株,后在三天后, 使用称为生物测定引导分馏的过程测试了每株植物的水培溶液样本。