李某设计的计算机软件，进行了著作权登记。其著作权保护期为（）

相邻关系的实质是

延期纳税利于企业资金周转、节省利息支出，通胀的情况下，会增加实际的应纳税额。 （ ）

London's River Thames has twenty-seven bridges. But Tower Bridge, the first bridge over the Thames as you travel to London from the sea, is the most famous of them all. What makes Tower?Bridge so exciting? Why do visitors come from all over the world to see it?The thing that is surprising about Tower Bridge is that it is open in the middle. It does this to let the?big ships through to the Pool of London. If you are lucky enough to see the bridge with its two opening arms high in the air, you will never forget it.On its north side stands the Tower of London itself. Although they look the same age, the Tower is?almost a thousand years old, and Tower Bridge is only about one hundred, it was built in the 1890s.?By1850, everyone agreed that a bridge across the Thames near the Tower was most necessary. But?the designers argued about the new bridge for another?thirty years. This took so long because they had?two big problems.

如果消费者消费15个面包获得的总效用是100个效用单位，消费16个面包获得的总效用是106个效用单位。则第16个面包的边际效用是（    ）效用单位。

如果上游工厂污染了下游居民的饮水，按科斯定理，（    ）问题就可妥善解决

菲利普斯曲线具有以下特征（     ）

管理沟通就是（    ）之间对某种信息传递与理解。沟通所传递的信息包括客观情况和事实，也包括人的思想、意见、态度和感受等。

只要投资增加国民收入就一定成倍的增加，这就是乘数理论所揭示的一般原理。