—The visit to the Summer Palace will be cancelled because of the bad weather .

—Oh，no! ________.[ ]

A. I hope so

B. I was looking forward to it for so long

C. I'm afraid not

D. It doesn't matter

型号为FZ18-35的防喷器，其中FZ表示（）。

A、全封防喷器

B、闸板防喷器

C、单闸板防喷器

D、自封封井器