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调整账户与其被调整账户的余额方向相反
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转鼓真空过滤机的生产能力与转鼓的转速有关，在其它条件不变的情况下，转速增大一倍，生产能力将增大（）倍。
CFifty 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. Fifty years ago,animals in the zoos often became ill because they （）.
从宏观上划分，计算机病毒的逻辑结构包括病毒的引导模块、（）和发作模块。
企业视同销售计算“应交税费——应交增值税（销项税额）”的情形有（）
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