旅客托运行李至客票到站以远的车站时,行李计费径路比照包裹计费径路办理。()
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车站需要取消发车进路时,应先通知(),并确认列车尚未启动时,方可取消()。
同一构件中,相邻纵向受力钢筋,其绑扎搭接头中的钢筋的横向净距不应小于()。
A. 钢筋直径
B. 且不小于30mm
C. 且不小于25mm
D. 且不小于20mm
To parallel an incoming machine to a running machine therefore it is necessary to ensure firstly that ().
A. two frequencies must be brought into phase
B. the incoming machine accepts a small amount of load
C. the running machine must be unload
D. both voltages are equal