在3个HPB235级钢筋接头试件的拉力试验结果中,其抗拉强度均不得小于( )。
A.250MPa
B.300MPa
C.350MPa
D.500MPa
参考答案:C
根据首字母及汉语提示,完成下列单词的拼写,使句意明确,语言通顺。
小题1:Good sleep helps the body and brain grow and d______ _____(发展)
小题2:If you want to be a good teacher, you must be more p_______ ___(有耐心的)
小题3:A terrible disease has just broken out in Europe and it has caused a number of d__ __ ___ (死亡) in some European countries.
小题4:Tina is not a child any more. She can take care of h_______ ______(她自己).
小题5:He always believes that f______ ____(友谊) is more important than money.
阅读材料,回答问题。
区域地形特征对人类活动产生深刻影响。下图为我国汉中地区及周边地形图。
指出影响图中铁路线分布的主要区位因素。