Migration is usually defined as "permanent or semi-permanent change of residence". However, our concern is with movement between nations, not with internal migration within nations, although such movements often exceed international movements in volume. Today, the motives of people who move short distances are very similar to those of international migrants.

A . the indemnity B . the franchise C . the freight rate D . the cargo cost

A . 正确 B . 错误

A . you can stop within your visibility range B . you can take proper and effective action to avoid collision C . you are traveling slower than surrounding vessels D . no wake comes from your vessel

A . Deviation B . Change C . Alteration D . Amendment

A . dehydration B . condensation C . evaporation D . dissolutio

A . you can stop within your visibility range B . the vessel is not subject to vibrations C . you are traveling slower than surrounding vessels D . you can take proper and effective action to avoid collisio

A .  It cannot be done in parallel. B .  It can be done at the table level or partition level. C .  It does not require additional storage because the operation is done online. D .  Local and global indexes are maintained automatically during the operation.

A . rate of doing work B . amount of force needed to overcome friction C . amount of work accomplished D . distance through which an object is moved

A . System Designer B . XCOPY deployment C . Deployment Designer D . Web Deployment

A . Global group nesting. B . Universal group nesting. C . Domain local group nesting. D . Universal security groups. E . Sid history attributes.&e

A . Individually before each node is upgraded B . Individually before and after each node is upgraded C . Individually after each node has been upgraded D . Collectively after all nodes have been upgraded

A . ALTER USER DEFAULT ROLE ALL B . ALTER USER DEFAULT ROLE ALL EXCEPT ROLE_1 C . ALTER USER DEFAULT ROLE NONE D . ALTER USER DEFAULT ROLE NONE EXCEPT ROLE_1

A . tropical storms B . good weather C . heavy rain and cloudiness D . heavy sea

A . produces pressure B . imparts energy to a fluid to move it from level ‘A’ to level ‘B’ C . creates a vacuum to move a liquid in all installation D . is to develop a pressure differential

A the total number of possible events divided into the expectations or frequency of the risk event B the number of times the risk event may occur C the fraction of the total project tasks which may be affected by the risk event D the total number of possible events divided into the consequences of the risk event. E A and B

是 否

A．YES B．NO

A．Exporter B．Importer C．Payer D．Agent

Although no one is certain why migration occurs, there are several theories. One theory is based upon the premise that prehistoric birds of the northen Hemisphere were forced south during the Ice Age, when glaciers covered large parts of Europe, Asia, and North America. As the glaciers melted, the birds came back to their homelands, spent the summer, and then went south again as the ice advanced in winter. In time, the migration became a habit, and now, although the glaciers have disappeared, the habit continues. Another theory proposes that the ancestral home of all modern birds was the tropics. When the region became overpopulated, many species were crowded north. During the summer, there was plenty of food, but during the winter, scarcity forced them to return to the tropics. A more recent theory, known as photoperiodism, suggests a relationship between increasing daylight and the stimulation of certain glands in the birds' bodies that may prepare them for migration. One scientist has been able to cause midwinter migrations by exposing birds to artificial periods of daylight. He has concluded that changes occur in the bodies of birds due to seasonal changes in the length of daylight. According to one theory, when the glaciers disappeared, birds ______. () A．stopped migrating B．continued migrating C．began migrating again D．migrated south and stay there

A．SDRSI B．SDRCI C．SDCRI