38. The franchising of the fast-food business altered which of the following:(A) corporate salaries(B) the nature of franchising(C) many companies' corporate images(D) people's eating habits

38. The franchising of the fast-food business altered which of the following:
(A) corporate salaries
(B) the nature of franchising
(C) many companies' corporate images
(D) people's eating habits

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3. 定義 Del 操作子為∇ := i + j + k。請問以下敘述何者為錯誤。 (A) ∇×(∇φ) = 0, 其中 φ 為具有連續一二偏階導函數的純量場。 (B) ∇ ⋅ (∇×F) = 0, 其中 F 為具有連續一二偏階導函數的向量場。 (C) ∇ ⋅ (F×G) = G ⋅ (∇×F) - F ⋅ (∇×G), 其中 F 與 G 為兩個連續平滑的向量場。 (D) ∇ ⋅ (φF) = ∇φ ⋅ F + φ(∇ ⋅ F), 其中 φ 為一連續平滑的純量場而 F 為一連續平滑的向量場。 (E) 以上(a) (b) (c) (d) 敘述皆錯誤。

38. The franchising of the fast-food business altered which of the following:(A) corporate salaries(B) the nature of franchising(C) many companies' corporate images(D) people's eating habits

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38. The franchising of the fast-food business altered which of the following:
(A) corporate salaries
(B) the nature of franchising
(C) many companies' corporate images
(D) people's eating habits