根据对话语境和所给首字母提示，填写正确的单词完成对话

A: Good morning.I'd like to see Mr Brown.

B: Do you have an a  1   ?

A: No,I'm a  2   not.I've just arrived in the town today.

B: Mr Brown is quite busy.I'm afraid he won't be able to see you today.

A: Do you think I can see him t  3   ?

B: Let me see. He's f  4   at 2:30 tomorrow afternoon. Can you come here on t  5   ?

A: Yes,I'll be here at 2:30. Thank you.

B: You are w  6  . Goodbye.

减压器既有稳压作用也有降压作用.（）