油品的粘度与烃类的（）和化学结构有密切的关系。

A.密度

B.分子量

C.特性因数

One advantage of price/sales (P/S) multiples over price to earnings (P/E) and price-to-book value (PBV) multiples is that :（）

A. P/S can be used for distressed firms.

B. Regression shows a p relationship between stock prices and sales.

C. P/S is more volatile than P/E multiples and, therefore, more reliable for use in valuation.