—I’m sorry, but I didn’t mean ____ out your secret.

—But you know, letting out secret means ____ one’s feelings.

A．to let; to hurt

B．letting; hurting

C．to let; hurting

D．letting; to hurt

粒度是粉碎质量的主要评定指标，一般用（）和粒度分布均匀度表示。