某地区拟建造一座排涝泵站，泵站设计净扬程为5.0m，设计选用5台机组，采用湿室型泵房，泵房进深为5.1m;地面以上部分采用砖混结构，选用MU7.5黏土砖及M5.0混合砂浆砌筑。泵房屋面采用现浇钢筋混凝土梁板结构，配筋使用HPB235钢筋。
施工单位根据有关规定和施工合同约定制定了该项目的质量与安全管理制度，并提交监理单位审核。前池基础未经验收施工单位就自行覆盖，监理单位要求钻孔探测，结果质量合格。
根据场景，回答下列问题：
本工程屋面大梁施工时，其承重模板设计起拱值宜取跨度的()。
A.O.2%
B.0.3%
C.0.4%
D.0.5%
参考答案：B
解析：承重模板及支架的抗倾稳定性应该验算倾覆力矩、稳定力矩和抗倾稳定系数。稳定系数应大于1.4。当承重模板的跨度大于4m时，其设计起拱值通常取跨度的0.3%左右。
Not long ago, I made up my mind to read a lot of books to get more knowledge. So I went to the library and 36 happily with several books. But after a few days, I felt impatient. The 37 of finishing all of them seemed impossible, because I always found it 38 to calm down to read a whole book. I didn’t know what to do with it. Then 39 one day I thought of "Why not make reading fun?" It gave me 40 again. Reading is a journey of spirit. Every time we read a book, we are actually talking 41 the writer. I tried to put all my effort into his or her books, 42 I could feel all of his or her happiness and suffering. Now books have become a part of my life. See? Attitude (态度) can make a great 43 . Someone once said,"Even though the situation is bad, people still have one freedom ( 自由) to 44 their attitude. "So,don’t complain about study or work. It helps 45 . Try to see things from a different way. Believe me; this will change the situation and help you a lot.
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