【多选题】丙烷中混有少量的乙烯,可用的去除方法有 ( )
【判断题】Air rage is mainly caused by unruly and disruptive passengers.
【单选题】岗位评价的直接信息来源,其特点不包括()。
【判断题】Crew members should provide better service to reduce air rage.
【简答题】According to the passage, which of the following reasons are given for air rage in the article?
【判断题】Drinking wine on board cannot lead to air rage.