A trend that occurs at the same time with the movement to the South and the Weast of the United States is ________.
A. the flow of people to sunbelt area
B. the flow of peole from small cities to big cities
C. the growth of small towns
D. the outflow of city residents from the core cities to the suburbs
查看答案
液态水具有流动性和粘滞性，两者具有相互关系，液体运动时的粘滞阻力能够使液体的流动加快起来（）
处于流动状态的水不易结冰。因此，未不使水带内的水冻结成冰，在冬季火场上，当消防队员需要转移阵地时不要关闭水枪（）
消火栓、灭火器材被遮挡影响使用或者被挪作他用的，单位应当责成有关人员限期整改（）
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