首先，本文介绍了轨控发动机推力矢量测试原理，及静态标定装置设计方案的选择。

Firstly, measuring principle of the thrust measuring system is introduced, and how to select the design schemes of static calibration.

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不能选择操作，选定的操作是当前操作的母轨。

Cannot choose this operator, since the selected operator is a parent of the current operator.

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本文介绍了地铁接触轨防护罩的结构设计、原材料选择、制造工艺、性能检测、质量控制等。

This paper introduces the structural design, raw mater ial selection, manufacturing process, property test and quality control method for contact rail protective cover board for Tehran Metro project.

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Let's begin with those in the majority who would turn to go onto the side track.

先从大多数选择了转向侧轨的同学开始。

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It's a tragic circumstance but better to kill one so that five can live, is that the reason most of you had, those of you who would turn? Yes?

虽然是悲剧,但牺牲一人保全五人依然是更正确的选择，这就是大多数人选择把电车开上侧轨的理由吗？

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