Read the signaling guide. Then, choose the correct answers.

A、Readthesignalingguide.Then,choosethecorrectanswers.
C、(1)(单选题)Whatisthepurposeoftheguide?
D、Whatisthepurposeoftheguide?
A、todescribechangesinrailsignaling
F、todescribechangesinrailsignaling
B、tolisttypesofsignalsusedintheyardK、tolisttypesofsignalsusedintheyard
C、toexplainhowtomakedifferentsignalsN、toexplainhowtomakedifferentsignals
D、toshowhowdifferentsignalscanhavesimilarmeaningsQ、toshowhowdifferentsignalscanhavesimilarmeaningsR、(1)(单选题)Accordingtotheguide,whichofthefollowingisNOTameaningofahandsignal?Accordingtotheguide,whichofthefollowingisNOTameaningofahandsignal?
A、stopY、stop
B、backup
C、disconnect
D、slowdown^、(1)(单选题)Whatisareasontheengineerssoundtheirbellsorwhistles?_、Whatisareasontheengineerssoundtheirbellsorwhistles?
A、toconfirmtheyhavereceivedasignalb、toconfirmtheyhavereceivedasignal
B、tosignalanemergencyd、tosignalanemergency
C、toaskforpermissiontostopf、toaskforpermissiontostop
D、toindicatetheyaregoingtospeedup