Where must an object be placed in front of a converging lens in order to obtain a virtual image？

irst step is（）, where you investigate business processes and document what the new system must do to satisfy users. This step continues the investigation that began during the（）. You use the fact-finding results to build business models, data and process models, and object models. The deliverable for the systems analysis phase is the（）, which describes management and user requirements, costs and benefits, and outlines alternative development strategies. The purpose of the systems design phase is to create a physical model that will satisfy all documented requirements for the system. During the systems design phase, you need to determine the（）, which programmers will use to transform the logical design into program modules and code. The deliverable for this phase is the（）, which is presented to management and users for review and approval.

A.System logical modelingB.use case modelingC.requirements modelingD.application modeling A.systems planning phaseB.systems modeling phaseC.systems analysis phaseD.systems design phase A.system charterB.system scope definitionC.system blueprintD.system requirement document A.application architectureB.system data modelC.system process modelD.implement environment A.system architecture descriptionB.system design specificationC.system technique architectureD.physical deployment architecture

A.物体

B.目标

C.宾语

D./

A.It can be any class.

B.No class has access to base.

C.The class must belong to the geometry package.

D.The class must be a subclass of the class Hypotenuse.

The most widely used equation for estimating visibility is the Koschmeider equation:

(2.4)

where L_Vis the visual range, the distance at which an average person can barely distinguish a dark object (such as a mountain or skyscraper) against the sky. This equation is an approximation, based on an average set of atmospheric particles.

A.Foreign key references cannot cross schema boundaries.

B.A DB2 user must be created before a schema with the same name can be created.

C.If no schema is specified when an object is created, the default schema PUBLIC is used.

D.A schema enables the creation of multiple objects in a database without encountering namespace collisions.

A.What

B.Which

C.How

D.Where

When saving a document you must decide on a name for the document and the(75) where it will be saved to.

A．location

B．size

C．title

D．attribute

A. Add a TraceContextEventHandler to the Trace.TraceFinished event to add the trace records into the database.

B. Add a system.diagnostics section to the Web.config file. Then add a listener to the new section.

C. Use the System.Diagnostics.Trace object to connect to a database. Then insert the trace records.

D. In the Page_Load for the page, place the Trace.Write call into a SQL INSERT statement.

A. All dependent objects remain valid.

B. Only the procedure and function become invalid and must be recompiled.

C. Only the view becomes invalid and gets automatically revalidated the next time it is used.

D. Only the procedure and function become invalid and get automatically revalidated the next time they are called.