B737 has___ fuselage and fully__landing gear.
A.semi-monocoque, unretractable ; B.monocoque,retractable; C.monocoque,unretractable; D.semi-monocoque, retractable ;正确答案D
B737 has___ fuselage and fully__landing gear.
A.semi-monocoque, unretractable ; B.monocoque,retractable; C.monocoque,unretractable; D.semi-monocoque, retractable ;正确答案D