闭式与开式模膛相比有什么特点（）。

A.闭式模锻可以得到几何形状、尺寸精度和表面质量最大限度地接近产品零件的锻件

B.降低材料的利用率

C.闭式模锻时形成飞边

D.开式模锻时不形成飞边

An analyst does research about price multiples. Which of the following statements is least accurate to explain using the price-to-sales ratio in equity valuation is better than the price-to-earnings ratio（）

A. Sales are more stable than earnings.

B. Earnings are sometimes negative.

C. Sales are the main driver of equity value.