A、<img width="44" height="24" src="http://admintk.100xuexi.com/UpLoadImage/2016-10-26/df66fb91-f927-4012-a310-c3ada39f0c89.png" />，<img width="52" height="24" src="http://admintk.100xuexi.com/UpLoadImage/2016-10-26/66fda421-404b-4014-82e6-a60fa06290e0.png" />
B、<img width="44" height="24" src="http://admintk.100xuexi.com/UpLoadImage/2016-10-26/df66fb91-f927-4012-a310-c3ada39f0c89.png" />，<img width="52" height="24" src="http://admintk.100xuexi.com/UpLoadImage/2016-10-26/f1c0311b-6653-4583-b688-be099480a891.png" />
C、<img width="44" height="24" src="http://admintk.100xuexi.com/UpLoadImage/2016-10-26/ff6b91c8-21f9-47f5-95b2-286f9f83d7cd.png" />，<img width="52" height="24" src="http://admintk.100xuexi.com/UpLoadImage/2016-10-26/66fda421-404b-4014-82e6-a60fa06290e0.png" />
D、<img width="44" height="24" src="http://admintk.100xuexi.com/UpLoadImage/2016-10-26/ff6b91c8-21f9-47f5-95b2-286f9f83d7cd.png" />，<img width="52" height="24" src="http://admintk.100xuexi.com/UpLoadImage/2016-10-26/f1c0311b-6653-4583-b688-be099480a891.png" />
查看答案
和孔口收缩断面流速
与管嘴流量
和管嘴出口流速
的关系是（ ）。