【简答题】Smith Sports Equipment P.O.Box 1014 Tulsa, Oklahoma 74109—1014 Phone 918 555-12 Fax 918 555-0170 September 21, 2002 Mr. Michael Trigg 17 Westwood Place Quincy, MA 02171 Dear Mr. Trigg, Thank you for...
【单选题】听力原文:W: Good morning, Mr. Smith. I hope I'm not disturbing your work. M: Not at all, Mary. Come in and take a seat. I'm always in my office before lunch. W:I want to tell you that I have already start...
A.
She wants to invite him to lunch.
B.
She wants to talk to him about her paper.
C.
She wants to talk to him about his work.
【判断题】Mr.Smith and Mr.Ma are happy for their friendship and cooperation.
【判断题】机器的等效质量等于组成该机器的各构件质量的总和。
【多选题】下列关于钢管混凝土拱桥的说法中,正确的有( )。
A.
钢管的套箍作用大大提高了混凝土的塑性性能,使得混凝土脆性的弱电得到克服
B.
随着轴向力的增大,内填型钢管混凝土使得混凝土的径向变形受到钢管的约束而处于三向受力状态,承载能力大大提高
C.
混凝土填于钢管之内,增强了钢管管壁的稳定性,刚度也远大于钢结构,使得整体稳定性有了极大的提高
D.
钢管混凝土材料应用于以抗拉为主的构件中,较之钢结构和混凝土结构有着极大的优越性
E.
钢管混凝土结构的应用,使拱桥的跨越能力得到提高,同时使拱桥更加轻巧、美观