问题
单项选择题
Open-Close原则的含义是一个软件实体（）。
A.应当对扩展开放，对修改关闭
B.应当对修改开放，对扩展关闭
C.应当对继承开放，对修改关闭
D.以上都不对
答案
参考答案：A
搜题请搜索小程序“爱下问搜题”
Open-Close原则的含义是一个软件实体（）。
A.应当对扩展开放，对修改关闭
B.应当对修改开放，对扩展关闭
C.应当对继承开放，对修改关闭
D.以上都不对
参考答案：A
| 阅读理解。 | |||
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| A. call 021-58609228 B. fax 021-58609728 C. email cherrylf@hotmail.com | |||
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| A. Shanghai. B. Guangzhou. C. Beijing. | |||
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| A. Sunday B. Friday C. Wednesday | |||
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| A. 138 yuan. B. 200 yuan. C. 208 yuan. |