【简答题】三相异步电动机的控制电路一般分为 运转控制电路和 运转控制电路。
【简答题】钢筋混凝土偏心受压柱,截面尺寸b×h=450mm×650mm,承受轴向压力设计值N=3500kN和柱端弯矩设计值M 1 =M 2 =510kN·m。构件的计算长度l 0 =10.0m。混凝土强度等级为C35,钢筋采用HRB400。若a s =a' s =40mm,要求进行截面对称配筋设计。
【简答题】钢筋混凝土偏心受压构件,截面尺寸为b×h=400mm×500mm,构件在弯矩作用方向和垂直于弯矩作用方向上的计算长度l 0 =2.5m。承受的轴向力N d =400kN,弯矩M d =240kN·m。采用C20混凝土(f cd =9.2MPa,f td =1.06MPa),纵向钢筋采用HRB335级钢筋(f sd =f' sd =280MPa),ξ b =0.56,a s =a' s =40mm,...
【单选题】Any donation you can give will help us ________ the suffering and isolation of the homeless this New Year.
【简答题】五、词汇:根据句意及首字母提示,补全单词(共5小题,每小题2分,计10分) 1.My iPad was broken. Can you f______ it up tomorrow? 2.Every year we have charity days to r______ money for unfortunate people. 3.The boy is so c_____ that he ca...
【简答题】钢筋混凝土偏心受压构件,截面尺寸为b×h=400mm×400mm,构件在弯矩作用方向和垂直于弯矩作用方向上的计算长度l 0 =4.0m。承受的轴向力N d =340kN,弯矩M d =190kN·m。采用C20混凝土(f cd =9.2MPa,f td =1.06MPa),纵向钢筋采用HRB335级钢筋(f sd =f' sd =280MPa),ξ b =0.56,a s =a' s =40mm,...
【判断题】给定在n+1个不同的数处的取值,可以唯一确定一个次数不超过n的多项式。()
【简答题】My car is broken, can you _____________________ ?
【简答题】试述幼儿教师应如何感知觉规律组织教育教学活动?