A、B二弹簧的劲度系数分别为kA和kB,其质量均忽略不计。今将二弹簧连接起来并竖直悬挂,如图所示。当系统静止时,二弹簧的弹性势能EPA与EPB之比为( )<img src="/lqwvjeImg/cd/cd5dfdf4a3c1852e3304b6de1a1b5f8d.png" style="font-size: 20px; width: 93px; height: 134px;"><br>· <img src="/lqwvjeImg/63/63bc2e287edeebcc15b552372d9f6a0e.png"style="width:65px;height:48px;"><br>· <img src="/lqwvjeImg/15/156d94ab7f7af08d7b69bd0ad74fe7ad.png"style="width:65px;height:49px;"><br>· <img src="/lqwvjeImg/4e/4eefd0b79229d6efc43e161116e81332.png"style="width:65px;height:48px;"><br>· <img src="/lqwvjeImg/b5/b5da21105b6735ffdf44b32e1777aa34.png"style="width:65px;height:49px;">