何为“踏车”现象？微管和微丝的“踏车”现象有何生理意义？。
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The full title of the U.K. is the United Kingdom of （）and （）
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踏车现象
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踏车现象
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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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Solid waste generation，and electricity and water consumption are costly and have their own set of environmental（）.
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Whose duty is it to examine and verify the vessel’s classification and technical state and condition?（）.
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