[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$f687mHHjTNdmE0_SoJixD1hBbulHdlGrKTTDBsm-hVZ4":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":10,"question":13,"related":14,"source":18,"type":19},[],"2025-12-26 09:15:36",1070247040,[8,9],"对","错",{"courseImg":11,"courseName":12},"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fb08a353b0dfc60dc6f890a2e9b036890.jpg","[共享课]Introduction to Railway","The high price of insulating material polyethylene makes the CC mode for power supply a cost-effective solution. True or False? ( )",[15,20,30,40,49,58],{"answer":16,"createTime":5,"id":6,"options":17,"question":13,"source":18,"type":19},[],[8,9],"v2",3,{"answer":21,"createTime":5,"id":22,"options":23,"question":28,"source":18,"type":29},[],1070247064,[24,25,26,27],"They are considered the "heart" of an electric traction power supply system","They have dual power supplies","They are also called main transformers","They convert three-phase 110 KV AC into the single-phase 27.5 kV AC","What are the two keywords about traction substations mentioned in this chapter? ( )",1,{"answer":31,"createTime":5,"id":32,"options":33,"question":38,"source":18,"type":39},[],1070247096,[34,35,36,37],"Network-wide railway junction terminal","Regional railway junction terminal","Local railway junction terminal","Industrial railway junction terminal","What type of railway junction terminal is generally located at a railway network end or in the areas of large industrial enterprises?( )",0,{"answer":41,"createTime":5,"id":42,"options":43,"question":48,"source":18,"type":39},[],1070247170,[44,45,46,47],"Rail cross-section","Rail foot","Rail shoulder","Rail root","What is the term for the part of the rail that consists of the rail head, rail web, and rail base?( )",{"answer":50,"createTime":5,"id":51,"options":52,"question":57,"source":18,"type":39},[],1070247181,[53,54,55,56],"Structural clearance","Rolling stock clearance","Clearance for exceeding goods","Safety clearance","Which clearance is mainly used for loads that surpass typical size or weight limitations? ( )",{"answer":59,"createTime":5,"id":60,"options":61,"question":62,"source":18,"type":19},[],1070247393,[8,9],"The Sichuan-Tibet Railway is the most difficult railway to build in the world. ( )"]