A female client is being treated for genital herpes. The client should receive teaching on the （）.

A．prevention of outbreaks of lesions.

B．need to abstain from sexual contact.

C．need to keep the perineal area moist.

D．need to wear tight-fitting nylon underwear.

当产量一定，不同工艺方案的固定成本的可变费用不同时，按照经济原则来评价工艺方案时()

A、单位可变成本最低的工艺方案最优

B、单位可变成本最高的工艺方案最优

C、单位可变成本中等的工艺方案最优

D、单位可变成本为零的工艺方案最优