___in the air, this kind of steel become harder and harder.A.CoolingB.Having cooledC.Being cooledD.C

题目简介

___in the air, this kind of steel become harder and harder.A.CoolingB.Having cooledC.Being cooledD.C

题目详情

___in the air, this kind of steel become harder and harder.
A.CoolingB.Having cooledC.Being cooledD.Cooled
题型:单选题难度:偏易来源:不详

答案

D

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