What was a key idea of Smith’s? A.That packages could be delivered on other companies’ planes B.That he should focus on passenger service C.That passenger service had to be efficient. D.That package delivery should be separate from passenger service
Đáp án đúng: D Giải chi tiết:Đáp án là D. Ý trong bài: Smith achieved efficiency in his model by designing a system that was separate from the passenger system and could, therefore, focus on how to deliver packages most efficiently