题型:问答题 Without the air to hold some of the sun’s heat, the earth at night_____very cold, too cold for us to live. A.will beB.would have beenC.isD.would be 查看答案
题型:问答题 热轧HPB235级钢筋经多次冷拔后,其物理力学性能变化,以下叙述何者为不正确A.钢材内部结构组织发生变化B.其强度随冷拔的次数增加而提高C.屈服点提高,但屈服台阶无显著变化D.塑性性能大大降低 查看答案