问答题A set dominoes(多米诺) consists of rectangular (矩形的) tiles each carrying two numbers from 0 to 6 which represented by patterns of spots. Every possible pairing of numbers occurs just once including each number with itself.　　How many dominoes are there in

Exhibit:You are creating a composite control for capturing user address information in a Web application. You define a number of properties that the user can set at design time. You need to group these properties in the Properties dialog box. In addition, you need to ensure that when users click on a particular property, they receive a short explanation of that property. The properties are shown in the exhibit. Which two actions should you perform?（）

A. Attach the Category attribute class to the controls class definition. Set its value to UserAddress. Mark the class as public.

B. Attach the Browsable attribute class to each property in the group. Set its value to True. Mark the property as private.

C. Attach the Category attribute class to each property in the group. Set its value to UserAddress. Mark the property as public.

D. Attach the Description attribute class to each property in the group. Set each value to a description of the given property.

E. Attach the DefaultProperty attribute class to each property in the group. Set each value to a description of the given property.

I try to _____ a few dollars each month in order to buy a new bike.

A、set up

B、set out

C、set off

D、set aside

A.consists in

B.consists of

C.consists for

D.consists with

The minimum amount of lifesaving equipment required aboard an 85-foot uninspected towing vessel consists of ______．

A.One approved flotation cushion for each person on board

B.One approved life preserver for each person on board and one life ring

C.One approved inflatable vest for each person on board

D.Lifeboat capacity equal to 1 1/2 times the number of persons on board

In the RGB color spaces, each pixel on the screen has a corresponding RGB value which consists of(71)components.

A．two

B．three

C．four

D．six

A Windows Communication Foundation (WCF) application uses a data contract that has several data members. You need the application to throw a SerializationException if any of the data members are not present when a serialized instance of the data contract is deserialized.What should you do?（）

A. Add the KnownType attribute to the data contract. Set a default value in each of the data member declarations.

B. Add the KnownType attribute to the data contract. Set the Order property of each data member to unique integer value.

C. Set the EmitDefaultValue property of each data member to false.

D. Set the lsRequired property of each data member to true.

A. set apply-groups node$

B. set apply-groups (node)

C. set apply-groups $(node)

D. set apply-groups (node)all

The book () eight chapters, with each of them compactly organized.

A、consists

B、composed

C、consists of

D、composes

A.an attribute or a set of attributes with a unique value for each tuple of a relation

B.a set of attributes referring to another relation in the database

C.an attribute or a set of attributes that is potentially the primary key of a relation

D.an attribute or a set of attributes that is potentially(有潜力地)the super key(超键)of a relation