一战时期的飞机，就是木头框架，外面用布包裹。二战时进步到铝合金，性能提高了很多。纸板做机身，速度，航程，和载荷都会受影响

来源: easycity 于 2023-08-29 19:01:33 [旧帖] [给我悄悄话] 本文已被阅读：次

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.