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利用轨道的钢轨作导体,在一定长度的钢轨两端装设轨道绝缘物体(绝缘节),中间的两条钢轨间的轨缝用轨道接续线连接起来,并用引接线连接电源和接收设备的电路叫轨道电路。
ZG80-1500型电机车在控制电路中在13#电空电磁阀线圈前加入14#电空的常闭接点有何意义?
下面哪些消息是前向地址消息().
中国近代图书馆的代表人物是()。
呼吸气急而短促,短气不足以息,数而不相接续者为()
“历史不过是追求着自己目的的人活动而已”,这句话表明()。
简述SCM战略的关注点
MS最小接收信号等级是指通过对上行信号强度的限制,启动控制覆盖的目的。
下列选项中属于定型效应的是()。
在一个生产车间里,集中了各种不同类型的生产设备和不同工种的工人,对某种产品进行不同工艺方法加工的是()。
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When Ian was injured, Harry was chosen as a last-minute ______ for the rugby tea...
When Ian was injured, Harry was chosen as a last-minute ______ for the rugby tea...
When Ian was injured, Harry was chosen as a last-minute ______ for the rugby tea...
– What's the problem, Harry?-()
– What's the problem, Harry?-()
— What's the problem, Harry? --- ()
— What's the problem, Harry? --- ()
ia、iou、ian、ing都是齐齿呼韵母。
Three people,(), were injured in the accident.
Three people,(), were injured in the accident.