Aircraft Flight Operation Regulations Article 285-8
Airplanes operating above FL 25,000 feet shall have available at the flight duty station a quick-donning type of oxygen mask which will readily supply oxygen upon demand.
中文原文 航空器飛航作業管理規則第285-8條
飛機於二萬五千呎以上飛航時，每一駕駛員操作席位應裝置快速戴上式氧氣面罩。