未知题型
A diadic color scheme is one using two colors that are two colors apart on the color wheel (e.g. red and orange)
A diadic color scheme is not defined by colors that are two ......
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单项选择题 做好投诉管理工作，重点是做好（）工作
未知题型 过滤器的选用应根据物料的流速、性质、温度、管径等条件正确选择，其材质应为不渗漏、不吸附、不生锈、无死角、耐腐蚀、光滑平整、易清洗消毒的材料制成（）
单项选择题 The food at this hotel disgusts me. Why not _________ at the restaurant across the street?
