题目

The cheapest room and board in Jefferson City, Missouri，over the weekend was at the county(县)jail(监狱)，and 170 people gladly checked in．Cole County charged$30 a night for anyone who volunteered to go behind bars on Friday or Saturday night SO officials could give the new jail a test run before it opened for real this week．People from three states spent the night at the jail，including some lawyers and a couple celebrating their first anniversary． “It was something they could experience without having to get a criminal record，”Cole County Sheriff(治安官)Greg Whit如图所示中x、y、z为三个物块，K为轻质弹簧，L为轻线．现用恒力F使系统竖直向上以加速度a做匀加速运动，取竖直向上为正方向．某一时刻L突然断裂，用ax、ay分别表示L刚断裂时x、y的加速度，则有A.ax＞a、ay＞aB.ax＞a、ay＜0C.ax=a、ay＞aD.ax=a、ay=a