Which of the following is true regarding the use of switches and hubs for network connectivity（）。

A . preparation for stand-by should be organized by engine room B . engine trails should be agreed with bridge, and then do it C . As to engine trials of the twin diesels and two propellers, the two diesels should use “slow ahead” at the same time D . After engine trials, the handle of the engine telegraph should be put in the “stop” positio

A . Fourteen servers per rack likeBladeCenter B . Two servers per rack for optimal cooling cost C . One server per rack for optimal cooling and energy efficiency D . Four servers per rack （twoexach half high） for optimal cooling

A.A bit of flowers. B.Few words. C.This work. D.Another two girls.

A．Right of access at all times to the company’s books, accounts and vouchers. B．Right to require from an officer of the company such information or explanations as they think necessary for the performance of their duties as auditors. C．Right to receive all communications relating to written resolutions. D．Right to receive all notices of,and other communications relating to, any general meeting which a member of the company is entitled to receiv E．

A．The 18th century was the age of steam engine. B．The 19th century was the time of the great mechanical system. C．The 20th century was marked by installation of telephone networks and the invention of television. D．None of the above.

A．We use all the words, phrases and quotations from Shakespeare's writings. B．Shakespeare's writings have become the property of those who are learning to speak English. C．It is likely to be true that people often do not know the origin of the words they use. D．All the words people use are taken from Shakespeare's writings.

A．It is responsible for pricing the items for rent. B．It develops vigorously in the past few years. C．It provides insurance for valuable items rented. D．It offers the fastest car rental services in France.

A．It refers to the phenomenon that people usually undervalue their creations. B．It is put forward by the honorable and successful manufacturer IKEA. C．It explains why the participants think highly of their own origami. D．It accounts for the popularity of do-it-yourself among youngsters.

A．A majority of Venezuelans believe Chavez handled government and foreign relations well. B．Chavez is regarded as the fiery opponent of President Bush. C．Chaves is perhaps Latin America's meat controversial leader. D．Chavez, the rightest president gained notoriety as an outspoken critic of the U.S. government.

A．foolishness B．stupid C．braveness D．intelligence

A．Algae has existed for more than 430 million years. B．It is impossible that algae might be the earliest plant on land. C．Plants get food from animals in the oceans. D．Evolution began after animals appeared on land.

A．Systems can be optimized B．Systems are linear in responsiveness C．Systems and their components can be optimized at the same time D．System components can be optimized 此题为多项选择题。

A．The man just got fire from a local grocery store. B．The woman forgot that the man is very optimistic. C．The woman won"t choose business as her major. D．The man doubts that she will make him proud.

A．active？trade？balance B．export？surplus C．simply？trade？surplus D．import？surplus