【简答题】There were people who would be glad to see him leave the plade, he knew it.
【单选题】It was a great _____ for him to be pleasant to people he didn’t like.
【简答题】空气中的二氧化碳由表及里向砼内部渗入,与氢氧化钙反应生成碳酸钙,使砼的碱度降低,减弱了对钢筋的保护作用,使钢筋生锈,这称为混凝土的 。
【单选题】电容器上的电压升高过程是电容器中电场建立的过程,在此过程中,它吸取的能量来自于
【单选题】He is _____ ,so many people like to be friends with him.
【单选题】At first many people disagreed to his opinions but ______ events have proved him to be right.
【简答题】碳化使混凝土 降低,减弱了对混凝土中钢筋的保护。
【单选题】It was a great _____for him to be pleasant to people he didn't like.
【多选题】碳化的主要危害有:( )
A.
使混凝土的碱度降低,减弱了其对钢筋的防锈保护作用,使钢筋易出现锈蚀
C.
显著增加混凝土的收缩而导致混凝土中出现微细裂缝,从而使混凝土的抗拉、抗折强度降低
D.
使混凝土膨胀,产生膨胀应力,严重时导致膨胀开裂