如图所示装置，O点是一固定点，活塞连接金属滑片， 活塞运动，滑动变阻器阻值随之改变。试管内是空气和足量的白磷，烧杯中盛放足量生石灰。闭合电键小灯泡发光，向烧杯中加入滴有酚酞试液的水，试推测：

(1)烧杯中的液体将呈现          色；

(2)与刚闭合电键时相比，小灯泡将          (填“变亮”、“变暗”或“和原来一样”)：

(3)活塞最终将停留在a的          位置(填“原来”、“偏左”或“偏右”)。

Costs included in the determination of a company’s economic profit that are also most likely to be included in that company’s accounting costs are:（）

A. explicit costs.

B. economic depreciation and foregone interest.

C. opportunity costs associated with labor provided by the company’s owners.