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问题描述：

[单选] 12号提速道岔，尖轨在第一拉杆中心处的设计动程为（）mm。
A．142 B．152 C．160 D．180
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答案解析：无
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上一篇：18号道岔允许速度大于160km/h时，尖轨在第一拉杆中心处的设计动程，为（）mm。 下一篇：尖轨在第一拉杆中心处的设计动程，直尖轨时为（）mm。

随机题目

道德具有可诉性。
国内连翘最大的集散加工中心为（）
A Two friends， Eric and Wendy， are sitting in a café enjoying a coffee． They talk and look at the other people in the café． There is a （）in a business suit sitting at a table near them． As he stands up to leave， his cellphone rings． He （）it and walks away ． Eric and Wendy realize that he has （）his briefcase（公文包）． He was troubled by the phone call． They both look at the briefcase for a moment and wonder if it is （）of money． But they only hesitate（迟疑）for a moment． They know that the briefcase （）the man， and he will be very （）he loses it． They both jump up from their chairs． Wendy runs after the man， shouting，“Hey， sir! Sir， you forgot your briefcase!" Eric stands next to the briefcase and （）． He wants to be sure that nothing happens to it while Wendy goes to find the man． When he hears Wendy， the man stops and looks at her．“I"m （）， I have to go，” he says into his cellphone， ending the call．“My briefcase! I cannot believe I forgot （）！Thank you so much!” He follows Wendy back to his （）in the café． He smiles at Eric， who is standing next to his briefcase without touching it． ＂Thank you so much，" the man says．“This briefcase is full of （）papers and some pictures of my family． These things are very important to me． I am so glad I did not （）them! Let me pay for your （）． You have really saved me today!” Wendy and Eric accept and say thank you to the man． They are glad （）takes his briefcase． And no one wants to lose important work （）special photos ． They enjoy their coffee even more after helping the man．1．
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