单选题操作回转式起重机时必须注意:() ①、不允许横向斜拉货物; ②、吊钩着地后不得再松钢丝绳; ③、钢丝绳切忌在舱口摩擦; ④、操纵者可随时离开操纵室检查A②、③、④B①、③、④C①、②、④D①、②、③
单选题
操作回转式起重机时必须注意:() ①、不允许横向斜拉货物; ②、吊钩着地后不得再松钢丝绳; ③、钢丝绳切忌在舱口摩擦; ④、操纵者可随时离开操纵室检查
A
②、③、④
B
①、③、④
C
①、②、④
D
①、②、③
参考解析
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