正方形板尺寸与受力情况如图所示。已知|<img src="/Image1/7d/7da4dd57790ebd5cbe31c9e6503df4f7.png" />1|＝|′下<img src="/Image1/7d/7da4dd57790ebd5cbe31c9e6503df4f7.png" />1|＝F，|<img src="/Image1/7d/7da4dd57790ebd5cbe31c9e6503df4f7.png" />2|＝|<img src="/Image1/7d/7da4dd57790ebd5cbe31c9e6503df4f7.png" />′2|＝2F，则该力系向B点的简化结果为（）。 <img src="/Image1/2a/2a1da0b258abcb64604352970f5a697f.png" /><br>A:<img src="/Image1/97/978402eabd4f47403cb4fc50f372ebf8.png" /><br>B:<img src="/Image1/51/5108a75ab21cac8cdb18f4383605fc2a.png" /><br>C:<img src="/Image1/74/74725dc3a05a9a23df584691df46739b.png" /><br>D:<img src="/Image1/37/378f3a2b41316e2d54e7f3460c6c435b.png" />