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下列属于个人防火墙缺点的是（）
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A:Excuse me,Miss.B:（26）A:Yes,l’d like to get some information about the summer course.B:（27）A:Can you tell me the starting and finishing time of the course,please?B:Yes.The course begins on July 15 and runs until August 20.A:OK,and what courses will we learn?B:There are listening,speaking,reading and writing （28）.A:Right,and what time will the classes be had?B:Well,most of them are in the morning.There are only a few classes in the afternoon.A:Do you have a （29）?B:Sorry.1 can’t get a timetable for you.A:That’s OK.And when will the final exams be held?B:（30）A:OK.Well,thank you,Miss. 30（）
信号在混频时若要不产生失真，则要求信号的各频率分量在频谱搬移过程中，要保持（）和（）不变。
Fifty years ago,zoos were places where people could go to see animals from many parts of world.The animals lived in cages that were easy to keep clean.However,for the animals,the cages were small and impossible to hide in.Although the zoo keepers took good care of them,many of the animals did not feel comfortable,and they often become ill.In modern zoos,people can see animals in more natural conditions.The animals are given more freedom in larger places so that they can live as they could in nature.In an American zoo,visitors can walk through a huge special cage that is filled with trees,some small animals and many birds.Some zoos have special places for visitors to watch animals that live in the desert or under water.Some other zoos have special places for animals that live in cold conditions like the bear from Arctic.Modern zoo not only show animals,but also keep and save rare animals,for the reason the grandchildren of today’s visitors will still be able to enjoy watching these animals. In modern zoos,（）.
SNMP的中文含义是（）
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