Man: Betty is always complaining about her son. Woman: She should take care of my three teenage boys and see what it's like. Question: What does the woman mean

A．Betty's life is easy compared with her own.

B．Betty has a more difficult life than she does.

C．Betty would like to take care of the three boys.

D．Taking care of her three teenage sons is easy.

为了提高聚合物熔体在加工中的粘度的稳定性，对刚性、柔性链聚合物各应严格控制哪些工艺条件？