Charley:Come on, Steve, (26)Steve: Wait a minute. (27)Charley:OK.Steve: By the way, can we give my sister a ride home tonight?Charley:Sure. (28)Steve: Yeah. She wants to take some pictures.Charley: (29)Steve: Yeah. She’d like to work for a newspaper someday.Charley:But I think it might be difficult for her to succeed.(30) 29()
A. I just have to close the shop.
B. I didn’t know Eva was interested in photography.
C. There are a lot of photographers out there.
D. You mean she’s coming to the game, too?
E. It’s time to go.
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为用户和开发人员之间交流和监督提供基础的报告是()
A. 可行性分析报告
B. 系统分析报告
C. 系统设计报告
D. 运行状况报告
系统设计可分为总体设计和()设计两个阶段,最终需要交付系统设计说明书
为了限制()和便于滚刀的(),国标除了对蜗杆的模数、齿形角作出要求外,还对蜗杆的()作了规定。
有一直径φ18mm传动轴,受中等载荷作用,要求沿截面性能均匀一致,工艺路线为:备料→锻造→正火→机械加工→渗碳→淬火→低温回火→机械加工,可供选择材料:16Mn、20CrMnTi、45、40Cr、40CrNiMo、T12。试回答问题。 低温回火的主要作用是为了消除()和减少脆性。