猛水蚤的前、后体部间的活动关节是在:()。 ["第5胸节与第1腹节间","第4与第5胸节间","第1与第2腹节间","各个胸节间"]
客室空调紧急逆变器在紧急运行时将()电源逆变为()电源 ["110Vdc/400Vdc","400Vac/110Vdc","110Vdc/400Vac","400Vdc/110Vdc"]
国际联运货物运单中,快运运单的正面和背面的上、下边带有1cm宽的()边,以区别于慢运运单。 ["红","黄","绿","黑"]
办理X至5G接车变通进路的操纵方法是?办理D1至ⅡG调车变通进路的操纵方法是?
国际联运货物运单有()种。 ["1","2","3","4"]
遥测站设备采用()和蓄电池浮充方式供电。