问题
单项选择题
受弯正截面承载力计算中，采用等效应力图形，其确定的原则（）。
A、矩形压应力图形面积与曲线形面积相等
B、保证压应力合力的大小与作用点位置不变
C、由平截面假定确定X=0.8Xc
D、试验结果
答案
参考答案：B
解析：
《规范》7．1．3条规定。
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受弯正截面承载力计算中，采用等效应力图形，其确定的原则（）。
A、矩形压应力图形面积与曲线形面积相等
B、保证压应力合力的大小与作用点位置不变
C、由平截面假定确定X=0.8Xc
D、试验结果
参考答案：B
解析：
《规范》7．1．3条规定。
The Christmas gift when I was seven years old has been a pleasant memory. other gifts, it came without wrap（包装）. On September 11ththat year, Mum gave to Richard. After she brought him home from ,she put him in my lap, saying, “I you a gift, and here it is.” What a/an ! I seven amonth earlier and none of my friends had such a baby doll of their own. I played with it day and night and told it over and over how much I loved it! One morning, however, I found its bed empty. My doll was ! I cried for it. Mum wept（流泪）and told me that the little thing had been sent to a hospital because of a fever. For several days, I heard mum andDad whispering such as “hopeless”, “pitiful”, and “dying”, which sounded . Christmas was coming. “Don’t any presents this year,” Dad said, pointing at the I hung in the living room. “ your baby brother lives, that’ll be Christmas enough.” As he spoke, his eyes filled with tears. I’d seen him cry before. The phone rang early on Christmas morning. Dad jumped out of bed to it. From my bedroom I heard him say, “What? He’s all right?” He and shouted upstairs. “The hospital said we can bring Richard home!” “Thank God!” I heard Mum cry. From the upstairs window, I watched my parents rush out to the car. I had never seen them so . And I was also full of joy. What a wonderful day! My baby doll would be home. I ran . My socks still hung there , but I knew they were filled with !
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