对同一台风机,尺寸不发生变化,且转速也未变化,如果所输送气体的密度由ρ0变为ρ,则风压Pf变为( ),流量Q变为( )

A、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1526097491015cb809501dd6047b09fe63365992213b9.png" alt="上传图片">

B、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1526097500315097c874df4534e41ac6896c13fde0910.png" alt="上传图片">

C、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1526097508900893ad1f570c04ee39d0aba1ea0c5bc60.png" alt="上传图片"><br>

D、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/15260975165745b19366d748b4420b3b8bda899957b6e.png" alt="上传图片">