48.下列何者為改善資產報酬率的運輸管理策略？
(A)最小化通路成本
(B)降低在途時間變異性
(C)降低缺貨率
(D)最佳化供應力

1. Find all critical points for the function f(x, y) = x3 - y3 + 33xy and classify each as a relative maximum, a relative minimum, or a saddle point. (A) fhas a saddle point at (11,-11) and a relative minimum at (0,0). (B) fhas a saddle point at (0,0) and a relative maximum at (11,-11). (C) fhas a saddle point at (0,0) and a relative minimum at (11,-11). (D) fhas a saddle point at (11,-11) and a relative maximum at (0,0).

2. Find the relative extrema of the function . Round your answer to one decimal place.  (A) Relative minimum is (0,0.3). (B) Relative minimum is (0,-0.3)； relative maximum is (1,0.3). (C) Relative minimum is (-1,-0.3)； relative maximum is (1,0.3). (D) Relative maximum is (0,0.3).

3. A bus company will charter a bus that holds 52 people to groups of 34 or more. If a group contains exactly 34 people, each person pays $65. In large groups, everybody's fare is reduced by $1 for each person in excess of34.Determine the size of the group for which the bus company's revenue will be greatest. (A) 34 with revenue $2210. (B) Groups of 49 or 50 with revenue $2450. (C) Groups of 49 or 50 with revenue $2210. (D) 34 with revenue $2450.

4.Determine whetherexists. (A) does not exist. (B) (C)

5.Suppose a person standing at the top of a building 240 feet high throws a ball vertically upward with an initial velocity of 32 ft/sec. When is the velocity 0? What is the significance of this time? Hint: Suppose the height of the ball above the ground at time t is H(t) = -16t2+ b t+c feet. (A) The ball is at its lowest point when t = 3 second. (B) The ball is at its lowest point when t = 2 second. (C) The ball is at its highest point when t = 1 second. (D) The ball is at its highest point when t :- S second.

6. Choose the correct sketch of the indicated level curve f(x,y) = C for the given constant C. f(x,y) = 9yex； C=2.(A)(B)(C)(D)

1. There is a sign saying “No trespassing.” This area is a private place, so people cannot enter this place without the owner’s _________. (A) passion (B) network (C) evidence (D) permission

2. You should dress up yourself on this formal __________. To show respect to the host, no slippers or casual clothes are allowed. (A) occasion (B) portion (C) identity (D) appeal

3. Chen Shu-Chu is a person of _______ character. Although she is just a vegetable vendor, she donates lots of money to the charitable organizations without expecting anything in return. (A) brutal (B) jealous (C) noble (D) curious

4. In the Indian culture, cows are thought to be _______ animals. They are respected in religious activities. (A) naive (B) sacred (C) courageous (D) anxious

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