Which of the following is the order of applying object-oriented concept in programming A: instance creating — class defining — use attributes or methods through the instance B: class defining — instance creating — use attributes or methods through the instance C: instance creating — use attributes or methods through the instance — class defining D: class defining — use attributes or methods through the instance —instance creating

Every instance of an abstract type is an instance of some concrete subtype.

For instance:

定义类的关键字是 ( ) A: Class B: class C: Instance D: instance

【单选题】下面的代码实现了设计模式中的()模式 public class A{ private A instance; private A(){} public static Aget Instance{ if(A==null) instance = new A(); return instance; } } A. Factory B. AbstractFactory C. Singleton D. Builder

管桩新国家标准的发布日期和实施日期分别为（）。 A: 2009/03/28；2010/03/01 B: 2010/01/01；2011/01/01 C: 2001/01/01；2012/03/01 D: 2008/07/01；2009/05/01

下列数据中，（）是日期型常量。 A: {^2005/01/01} B: "2005/01/01" C: 2005/01/01 D: 2005-01-01

下列比例中表示缩小比例的是（）。 A: 02:01 B: 01:02 C: 05:01 D: 01:01

下列比例中表示放大比例的是（）。 A: 01:01 B: 02:01 C: 01:02 D: 01:05

正则表达式(01|10|1001|0110)*与下列哪个表达式一样？1.(0|1)*2.(01|01)*3.(01|10)*4.(11|01)*5.(01|1)*