Residual Fuel Oil is a topped crude oil or viscous residuum that, as obtained in refining or after blending with other fuel oil, meets or is the equivalent of Military Specification Mil-F-859 for Navy Special Fuel Oil and any more viscous fuel oil, such as No. 5 [Bunker B] or No. 5 [Bunker C].
Ngari Gunsa Airport, also known as Ali Airport, is the fourth highest-altitude airport in the world. The dual-purpose military and civil airport serves the city of Shiquanhe in Ngari Prefecture, south-west of China's Tibet Autonomous Region near the Indian border. The airport is situated at an elevation of 4,274m.iuzhai Huanglong Airport, China. Jiuzhai Huanglong Airport is located two kilometres from Chuanzhusi Town, in Songpan County of Aba Prefecture, Sichuan Province. It is the world's tenth highest altitude airport, at an elevation of 3,448m. Chengdu Shuangliu International Airport is located 240km from this airport.
The world's highest mountain is Mt. Everest. It is located in the Himalayas on the Nepal-China border. Its elevation is 8448 m (29,029 ft). Mt. Everest 8,848 metres (29,029 ft) above sea level Mount Everest is called the world's highest mountain because it has  the highest elevation above sea level.