什么是重复时间（TR）和回波时间（TE）？
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何为梯度回波?
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回波时间TE
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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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何为重复时间(TR)?
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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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Solid waste generation，and electricity and water consumption are costly and have their own set of environmental（）.
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