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.

无线中继器的防雷地线接地电阻应不大于—（），山岩地段应不大于（）。