"одновременно или по очередности"  https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwji-sfeo7juAhVBHzQIHYM4C_EQFjAMegQIFRAC&url=https%3A%2F%2Fkrr.aero%2Fupload%2Fiblock%2Fa9a%2Frukovodstvo-po-nazemnomu-obsluzhivani.-chast-3-_-12.pdf&usg=AOvVaw0WMh7iVxYET6vyirklS3j8