以下是针对飞机上急救设备——手提式氧气瓶(型号为120升5500-A1A-BF23A/311升 5500-C1A-BF23A)的使用方法排序正确的是( C ) 1 逆时针打开开关;2 戴上氧气面罩,罩在口鼻处;3 打开防尘帽(根据需要);4取出氧气瓶; 5 插上氧气面罩;6 使用完毕后将氧气面罩从氧气出口断开, 取下氧气面罩, 顺时针转动氧气释放旋钮关闭氧气瓶。 A. ①②⑤③④⑥ B. ①②③④⑤⑥ C. ④③⑤①②⑥ D. ④③⑤②①⑥
【简答题】阅读理解。 There are four types of persons who go to work part-time. These include retirees who want a bit more income or socialization, parents who want to spend more time with their children, college and...