钢材的化学成分及其对性能的影响正确的是( )。 A.C含量增加将使抗拉强度提高 B 发布时间:2018-01-29 12:47 │ 来源:www.tikuol.com 题型:单项选择题 问题: 钢材的化学成分及其对性能的影响正确的是( )。A.C含量增加将使抗拉强度提高B.C含量增加将使焊接性能、耐腐蚀性能上升C.Si含量的增加可显著提高强度及硬度D.Mn含量的增加可改善热加工性能
题型:单项选择题 新建城市的规划人均建设用地指标宜在( )内确定。A.60.1~75.0m2/人B.75.1~90.0m2/人C.90.1~105.0m2/人D.105.1~120.0m2/人 查看答案
题型:单项选择题 读我国某省区地形图,回答下列问题。(1)山脉:A ___________________ C____________________(2)A、B山脉之间有大盆地 ______________,B、C山脉之间有大盆地 _________________,因此,人们形象地称这种地形特征是“______________________”。(3)此区域内有我国面积最大的沙漠,它是___________________________。(4)河流E的名称是_____________ ,河水主要补给来源于___________和____________。 (5)新疆发展绿洲灌溉农业的引水工程是______________________。 查看答案
题型:单项选择题 The Customs surveillance zone include the following places except ().A. any seaport, railway and high way station, airport, border pass or international postal matter exchange where there is a Customs establishmentB. any place where Customs control is conductedC. any place without a Customs establishment but which has been approved by the state council as a point of entry and exitD. any place along the border of the country 查看答案