单项选择题

如图所示,宽b=1 m的矩形闸门,下端用铰链固定,上端用钩子支撑,左侧水深h1=4 m,右侧水深h2=2 m,钩子离水面的距离a=0.5 m,则钩子和铰链所受的力F1和F2分别为（）
A.
18.34 KN；36.5 KN B.
20.34 KN；38.50 KN C.
21.34 KN；39.6 KN D.
28.34 KN;37.20 KN

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