最严重的急性高原病是()
A.高原心脏病
B.高原脑水肿
C.急性高原反应
D.高原肺水肿
E.高原红细胞增多症
参考答案:B
The government will begin a series of_____ to help the public fully understand the new educational system.
A.applications
B.Presentations
C.traditions
D.administrations
当客舱需要制冷时()
A、客舱压缩机工作,客舱氟利昂关断活门打开
B、驾驶舱压缩机停止工作,驾驶舱氟利昂关断活门关闭
C、压缩机工作,客舱氟利昂关断活门打开,驾驶舱氟利昂关断活门关闭