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

You work in a company which uses SQL Server 2008. You are the administrator of the company database. Now you are in charge of a SQL Server 2008 instance which is named Instance01. Instance01 contains a database which is named SellingHelp. There isthe Products table in the SellingHelp database. Now according to the company requirement, the Products table has to be replicated to the SQL Server instances installed in laptopscomputers. You have to create a Replication topology to perform this. The Products table is updated from Instance01 when the laptops reconnect to the corporate network. The Products table on Instance01 is frequently updated between reconnections. You must make sure that you can implement the Replication topology along with the Subscription type successfully and meanwhile reduce the bandwidth usage to the least.  So what action should you perform to achieve this goal?（） A: You should implement the Snapshot Replication topology along with a Push Subscription.  B: You should implement the Merge Replication topology along with a Pull Subscription.  C: You should implement the Snapshot Replication topology along with a Pull Subscription.  D: You should implement the Transactional Replication topology along with a Pull Subscription

中国大学MOOC: There are following business statements for an information system:①A customer submit 0 or more orders;②An order can only be submitted by one customer. There are two classes in the system “Customer” and “Order”. For each instance of Order Class, there are ____ instance(s) of Customer Class; while for each instance of Customer Class, there are ____ instance(s) of Order Class.

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