骨盆底外层肌肉不包括（）

A.球海绵体肌

B.坐骨海绵体肌

C.会阴浅横肌

D. * * 括约肌

E.肛门外括约肌

Which of the following is least accurate with regard to advertising for firms operating under monopolistic competition（）

A. The increase to average total costs associated with advertising increases as output increases.

B. Advertising expenses are high relative to perfect competition and monopoly.

C. Advertising is necessary to communicate the unique features of a firm’s products.