某大学校园网连入INTERNET,其IP地址的Net-id为132.253.0.0,该大学共有30个子网,子网掩码为255.255.255.0,试问:
(1)该大学的IP地址是A--E五类中的哪一类?哪些主机号host-id是不能使用的?
(2)该大学最多可有多少台主机(host)连入INTERNET?

未分类题What can be inferred from the last sentence of paragraph 1?A．Previous findings revealed what shapes us.B．Previous findings were accurate and trustworthy.C．Previous findings contributed in a limited way.D．Previous findings went too far in explanation.

未分类题You bought a refrigerator several days ago and there is something wrong with it. Write a letter to the store to complain your problems and extend (表达) your requirements. You should write about 100 words on ANSWER SHEET 2. Do not sign your own name at the end of the letter. Use 'Zhang Wei' instead. Do not write the address.

未分类题A given event will be described in several ways by______witnesses.A．manyB．as manyC．so manyD．same many

未分类题Theodor Adornos attitude towards the idea of 'writing for humanity' is one of______.A．strong disapprovalB．reserved consentC．slight contemptD．enthusiastic support

未分类题The second paragraph suggests that Plato wrote for______.A．the general readerB．an elite audienceC．the rulers of his timesD．his ideal philosophers

未分类题Send the note to______is in the office.A．whoeverB．whomeverC．no matter whoD．whichever

未分类题The number of names on the no-fly list increases rapidly from 16 to 20,000 most probably becauseA．terrorist attacks are launched frequently.B．many people's names are similar to known terrorists.C．the screening system is not effective enough.D．terrorists are not accurately identified after 9.11.

未分类题We may learn from paragraph 2 that it centers on______.A．the causes of the America's economic expansionB．the stimulative monetary and fiscal policiesC．the restoration of sounder liquidity positionsD．the President's economic policy moves

未分类题The bedroom is in a terrible mess; it______cleaned.A．can't have beenB．shouldn't have beenC．mustn't have beenD．wouldn't have been

未分类题What is the main idea of the passage?A．Great amount of food is wasted at public places.B．Individuals don't pay attention to food waste.C．It costs more money to make environmental friendly disposal,D．Lots of new methods are taken to dispose food waste.

未分类题What is the main reason for people paying attention to food waste?A．To lower the cost of food waste.B．To save more food for the world.C．To keep the dining room clean.D．To reduce the effort of cooking.

未分类题What kind of measure has been taken to cut food waste?A．Making cafeteria at collage and universities trayless.B．Using software system to trace the location of the trash.C．Trying to remove the food waste little by little.D．Charging higher prices for smaller amount of food.

未分类题Whats the benefit of installing food-only trash cans at the airport?A．It will reduce the cost of removing the trash.B．It will keep the airport clean and tidy.C．It will faster the process of making trash into compost.D．It will remind the passenger to produce less trash.

未分类题Exposure to asbestos fibers can cause cancer_____A．only when asbestos is used in building industryB．only when it is used in large quantitiesC．even if it is used in small quantitiesD．if they are used when wet rather than dry

未分类题What is the main idea of the first paragraph?A．Hawaii is in short of the hotels now.B．Japanese tourists account for the most part of the travelers.C．The unemployment rate in Hawaii is very low.D．Hawaii may change its 'welcome' policy.