Seeing______pictures, she couldn't help thinking of______happy days in______ ViennA．

A．/...the.../

B．/.../...the

C．the...the.../

D．the.../...the

低压风扇引气（LPFanAir）的作用

A、发动机进气口防病

B、进入预冷器，冷却高压压器机引气

C、防喘振

D、供空调引气