在紧急情况下，可使用F-43燃油替代F-34和F-40燃油。
A.in an emergency, you can use fuel F-43 as an alternative to fuels F-34 and F-40 B.In an emergency, you can replace fuels F-43 with fuels F-34 and F-40. C.in an emergency, fuel F-43 can be used as an alternate to fuels F 34 and F-40正确答案A
