A.命令旅客讓開 B.讓旅客讓路 C.不用打招呼 D.要先打招呼
A.1處 B.2處 C.3處 D.4處
A.GB/T10001.1、GB/T10001.2、GB/T10001.3 B.GB/T10001.1、GB/T10001.3、GB/T10001.5 C.GB/T10001.1、GB/T10001.3、GB/T10001.7 D.GB/T10001.1、GB/T10001.3、GB/T10001.10