下列除哪项外都是主治风湿热痹的药组（）
A.黄柏、蚕砂
B.木通、防己
C.独活、威灵仙
D.白鲜皮、薏苡仁
E.忍冬藤、络石藤
参考答案：C
—Excuse me. Could you tell me________?
—The traffic is too heavy.[ ]
A. where the station is
B. why the bus is late
C. when the bus is leaving
D. how to get to the station
标准差属于什么量数？（）
A.差异量数
B.集中量数
C.差异系数
D.相关系数
