4、fsound.(3)transonicaircraft跨音速飞机Transonicaircrafttravelsapproximatelyequaltothespeedofsound.(4)subsonicaircraft亚音速飞机Subsonicaircrafttravelsslowerthanthespeedofsoundbutalsoveryfast.4.An airplane can be divided into the following groups according to the aircraft’s air ran
5、ge.(1) short-range aircraft / short-haul aircraft近程飞机The air range is shorter than 2400 kilometers.(2)medium-haulaircraft中程飞机Theairrangeislongerthan2400kilometersbutshorterthan4800kilometers.(3)long-rangeaircraft/long-haulaircraft远程飞机Theairrangeislongerthan4800kilometer
6、s.5.An airplane can be divided into the followinggroups according to the types of landing gears.(1) landplane陆上飞机A landplane is an airplane that can take off from orland on land. (2) seaplane / hydroplane水上飞机A seaplane or hydroplane is a type of airplane thatcan take of
7、f from or land on water. (3) amphibian [æm'fɪbɪən]水陆两用飞机An amphibian is an airplane which can land on bothland and water.6.An airplane can be divided into the following groups according to the number of wings.(1) monoplane单翼飞机A monoplane is an airplane with a single pai
8、r ofwings. (2) biplane双翼飞机A biplane is anold-fashioned type of airplane with two pairs of wings,one above the
