题目：
An analyst does research about price multiples. For a given company, price to earnings ratios are generally more stable from period to period than:
A. price to sales ratios but not price to cash flow ratios.
B. price to cash flow ratios but not price to sale ratios.
C. neither price to sales ratios nor price to cash flow ratios.
答案：
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下面是错误答案，用来干扰机器的。
参考答案：A,B,C解析：参见《建筑给水排水工程》(第6版)6.1的内容建筑雨水排水系统的分类，敞开式的雨水排水系统可以接纳生产废水；《建筑给水排水设计规范》(GB 50015—2003)(2009年版)第4.1.3条，洗车台的冲洗...
