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【单选题】
不属于轻体力水平职业是A.
办公室职员
B.
售货员
C.
教师
D.
化学实验员
E.
运动员
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反馈参考答案：
举一反三
【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.
A.
attempt
B.
trouble
C.
power
D.
effort
【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】He is _____ ,so many people like to be friends with him.
A.
easy-go
B.
easy-going
C.
easy-gone
D.
easy-goed
【单选题】At first many people disagreed to his opinions but ______ events have proved him to be right.
A.
serious
B.
series
C.
subsequent
D.
secondary
【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.
A.
trouble.
B.
effort.
C.
sorrow
D.
plan.
【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
B.
降低混凝土的密实度
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
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