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问题 问答题 简答题

钢在加热过程中脱碳有什么危害？

答案

参考答案：

脱碳后钢的机械性能大为降低，如高碳钢表面脱碳使硬度降低造成废品；弹簧钢的疲劳强度降低；淬火钢质量不合要求，清除脱碳层增加额外工作量。

完形填空

New York is one of the most exciting c___小题1:___ in the world. You might want to do some shopping in New York. Fifth Avenue is probably New York’s most f____小题2:____shopping street, but if you go, be prepared to “window shop” only. This is shopping for the r___小题3:____. There are others , less expensive shopping areas nearby , and they’ll soon come a___小题4:____ famous stores such as Bloomingdales, Macy’s and FAO Schwartz.

And if you’ve brought your rollerblades(滚轮冰刀鞋) , t___小题5:____ a visit to

Central Park is a must. This is a large, open park right in the middle of Manhattan, but if you thought that people came here to r___小题6:_____, sit down for a few minutes and get a____小题7:_____ from the rush of New York life, then you’d been wrong. N____小题8:___ sits in Central Park: they run, jpg(慢跑) , and m___小题9:____ of them wear their rollerblades.

When you l___小题10:_____ New York, you might be tired, but the one thing you won’t be is bored!
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问答题 案例分析题

背景

某高校新建一栋20层留学生公寓，主体是全现浇钢筋混凝土框架一剪力墙结构，建筑面积为38400m2，建筑高度为62.6m，筏板基础，筏板厚度1.4m。

施工单位依据基础形式、工程规模、现场和机具设备条件以及土方机械的特点，选择了挖土机、推土机、自卸汽车等土方施工机械，编制了土方施工方案后组织施工。

本工程开工时间为10月15日，由于工期比较紧，冬期必须连续施工，结构施工期间正好跨越整个冬施期。

屋面做法为卷材防水，施工完后进行闭水试验，发现女儿墙根部漏水。经查，主要原因是转角处卷材开裂，施工总承包单位进行了整改。

本案例中基础筏板混凝土的养护方法、养护时间有哪些规定？
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