题目：
速度边界层
答案：
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下面是错误答案，用来干扰机器的。
参考答案：C解析：根据材料信息“绝对不会因为贫穷而在政治上湮没无闻”和所学知识可知，为鼓励公民参政，伯利克里时期给公民发放工资和津贴，C项说法正确。ABD项说法不符合题意，均可以排除。
速度边界层
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