问题
单项选择题
工字形截面轴心受压构件翼缘外伸宽厚比b'/t的限值为（）。
A.A
B.B
C.C
D.D
答案
参考答案：D
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工字形截面轴心受压构件翼缘外伸宽厚比b'/t的限值为（）。
A.A
B.B
C.C
D.D
参考答案：D
Dragon Head-Raising (龙抬头) Day is a traditional Chinese festival. It comes on the 46 day of the second lunar (农历的) month. In 2010, it is 47 March 7. On the day in ancient times, people put paths of ashes (灰) into kitchens and around water vats (缸). This was 48 the dragon into the house. On this day people eat noodles, dumplings and fried pancakes. All the day’s foods are 49 after dragons. For example, people eat “dragon whisker (龙须)” 50 called “dragons teeth”. In some ancient Chinese stories, dragons have power over the wind and rain. They often 51 rain to the world on the second day of the second lunar month. It is said that after that day there will be more and more rain. This is 52 the day is often called “Spring Dragon Day”. It was hoped that 53 the help of the dragon, ploughing (耕种) would be easier and the autumn would bring a good harvest. It was said that a haircut during the first lunar month brought 54 luck to the uncles in family. This is why you still see many people 55 their hair cut on Dragon Head-Raising Day.
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