單項選擇題

水由圖示噴嘴射出,流量Q=0.4m3/s,噴嘴出口流速v2=50.93m/s,噴嘴前粗管斷面流速v1=3.18m/s,總壓力P1=162.33kN,噴嘴所受到的反力大小Rx為:()

A.143.23kN
B.110.5kN
C.121.41kN
D.150.52kN