在支持()的同时,提高系统的()是面向对象设计的核心问题之一;()是支持可维护性复用的基本准则。开闭原则是其它面向对象原则的基础,实现开闭原则的关键是(),通过在系统中引入抽象层,如接口或()来实现。
A. 可维护性,可复用性,面向对象设计原则,抽象,抽象类
B. 可用性,可维护性,面向对象设计原则,抽象,抽象类
C. 可维护性,可复用性,面向对象分析原则,抽象,抽象类
D. 可扩展性,可复用性,面向对象分析原则,抽象,抽象类
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Kerem makes candles. If he charges $25 for each candle, his total revenue will be
A. $1,250 if he sells 100 candles.
B. $625 if he sells 25 candles.
C. $25 regardless of how many candles he sells.
D. $2,500 if he sells 5 candles.
The Bow Wow company produced and sold 400 dog beds. The average cost of production per dog bed was $40. Each dog bed can be sold for a price of $75. Bow Wow's total costs are
A. $17,500.
B. $16,000.
C. $30,000.
D. $46,000.