39. According to the passage, which franchise promoted the growth of other franchises?(A) fast food(B) electronics(C) bookstores(D) toys

39. According to the passage, which franchise promoted the growth of other franchises?
(A) fast food
(B) electronics
(C) bookstores
(D) toys

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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。

39. According to the passage, which franchise promoted the growth of other franchises?(A) fast food(B) electronics(C) bookstores(D) toys

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39. According to the passage, which franchise promoted the growth of other franchises?
(A) fast food
(B) electronics
(C) bookstores
(D) toys