Given that the current directory is empty, and that the user has read and write permissions, and the following: Which statement is true?（）
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The full title of the U.K. is the United Kingdom of （）and （）
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public and private colleges and universities and community colleges offer（）.
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（）is used for calling and replying,and for transmitting acknowleding and relaying distress alerts.
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The way in which people address each other depends on their age, sex, social group and personal relationship. The English system of address forms frequently used includes first name, last name, title+last name, （）, and kin term.
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装卸（Loading and Unloading）
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零点极点（zero and pole）
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零点极点 (z ero and pole)
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根轨迹方程 (magnitude and phase equations)
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Solid waste generation，and electricity and water consumption are costly and have their own set of environmental（）.
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