以下为句子列表：
英文: As a rule, when engineer wants to change over the pneumatic manoeuvring system to the mechanical manoeuvring system or vice versa, the engineer must perform the change-over operation with the engine stopped.
中文: 作为一个惯例，当轮机员要转换气动操纵系统到机械操纵系统或反过来转换机械操纵系统到气动操纵系统，轮机员必须在机器停止时进行转换操作。
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英文: Be equol to mounting two buttons and one change-over switch in one axe.Can output contact sighal or inspect signal before staring and stopping.
中文: 相当于2个按钮和一个切换开关装于一轴，在起动与停止之前均可输出联络信号或监控信号。
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英文: Note:the change-over difference means the difference between the temperature when the switch breaks and the one when the switch resets to close.
中文: 注：切换差是指开关断开时温度和开关恢复到闭合时的温度差。
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英文: The two slide machine guarantees that the part is always in the centre positioning of loading system is necessary after change-over to a new part.
中文: 双滑座机床保证了工件在模具的中心位置，在更换新产品时上料系统不再需要重新定位。
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英文: However, if we put the change-over properties of the flip-flop into a jingle, draw some relevant simple diagrams of the flip ? flop, or give the relation between the R, S and J, K, Qn, we can solve the problems effectively and successfully.
中文: 采用顺口溜来记忆触发器翻转特性,从RS触发器出发,画出简化图,写出R,S与J,K,Qn的关系,可以有效地使这些难点变得较易理解和掌握。
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