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专利实施许可合同只在该专利权的存续期间内有效，让与人在约定许可实施专利的范围内，将该专利仅许可一个受让人实施，让与人依约定不得实施该专利的，属于排他实施许可( )
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( )系统实施的最后一步是新系统的试运行和新旧系统的转换，它是系统调试和检测工作的延续。
母子公司之间存在控制与依附关系，其中母公司具有独立的法人资格，而子公司是可以领取营业执照、进行经营活动的非法人企业。( )
Look at your watch for just one minute. During that time, 174 babies were born in the world. Maybe you think that isn’t many. During the next hour, over 10440 more babies will be born in the world. So it goes on, hour after hour. In one day, people have to find food for over 250 000 mouths more. Just think how many more there will be in one year! What will happen in one hundred years The population (人口) problem may be the greatest one of the world today. The world’s population is growing faster and faster. Two thousand (千) years ago, there were only 200 million (百万) people in the world. Four hundred years ago, the number was over 500 mil- lion. But in the year 1900, the world’s population was about 1700 million. In 1970, this number was over 3 600 million. In 1990, the number was over 5 billion (十亿). People say by the year 2010, it may be seven billion. That means in about 600 years, there will be only standing room on the earth. One hundred years ago, there were also 174 babies being born in every minute.
在向数据表中输入数据时，若要求输入的字符必须是字母，则应该设置的输入掩码是______。
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